| 释义 |
cone
 conetop: right circular conebottom: cones and rods of a human eyecone C0556800 (kōn)n.1. Mathematics a. The surface generated by a straight line, the generator, passing through a fixed point, the vertex, and moving along a fixed curve, the directrix.b. A right circular cone.2. a. The figure formed by a cone, bound or regarded as bound by its vertex and a plane section taken anywhere above or below the vertex.b. Something having the shape of this figure: "the cone of illuminated drops spilling beneath a street lamp" (Anne Tyler).3. Botany a. A unisexual reproductive structure of most gymnospermous plants, such as conifers and cycads, typically consisting of a central axis around which there are scaly, overlapping, spirally arranged sporophylls that bear either pollen-containing structures or ovules.b. A similar, spore-producing structure of club mosses, horsetails, and spikemosses.c. A reproductive structure resembling a cone, such as the female inflorescence of a hop plant or the woody female catkin of an alder.4. Physiology One of the photoreceptors in the retina of the eye that is responsible for daylight and color vision. These photoreceptors are most densely concentrated in the fovea centralis, creating the area of greatest visual acuity. Also called cone cell.5. Any of various gastropod mollusks of the family Conidae of tropical and subtropical seas that have a conical, often vividly marked shell and that inject their prey with poisonous toxins, which can be fatal to humans. Also called cone shell.tr.v. coned, con·ing, cones To shape (something) like a cone or a segment of one.
[French cône and Middle English cone, angle of a quadrant, both from Latin cōnus, from Greek kōnos; see kō- in Indo-European roots.]cone (kəʊn) n1. (Mathematics) a. a geometric solid consisting of a plane base bounded by a closed curve, often a circle or an ellipse, every point of which is joined to a fixed point, the vertex, lying outside the plane of the base. A right circular cone has a vertex perpendicularly above or below the centre of a circular base. Volume of a cone: πr2h, where r is the radius of the base and h is the height of the coneb. a geometric surface formed by a line rotating about the vertex and connecting the peripheries of two closed plane bases, usually circular or elliptical, above and below the vertex. See also conic section2. anything that tapers from a circular section to a point, such as a wafer shell used to contain ice cream3. (Botany) a. the reproductive body of conifers and related plants, made up of overlapping scales, esp the mature female cone, whose scales each bear a seedb. a similar structure in horsetails, club mosses, etc. Technical name: strobilus 4. (Civil Engineering) a small cone-shaped bollard used as a temporary traffic marker on roads5. (Anatomy) Also called: retinal cone any one of the cone-shaped cells in the retina of the eye, sensitive to colour and bright lightvb (tr) to shape like a cone or part of a cone[C16: from Latin cōnus, from Greek kōnus pine cone, geometrical cone]cone (koʊn)
n., v. coned, con•ing. n. 1. a. a solid whose surface is generated by a line passing through a fixed point and a fixed plane curve not containing the point, consisting of two equal sections joined at a vertex. b. a plane surface resembling the cross section of a solid cone. 2. anything shaped like a cone: the cone of a volcano. 3. ice-cream cone. 4. a. the reproductive structure of certain nonflowering trees and shrubs, as the pine, consisting of hard or papery scales bearing naked seeds and arranged in an overlapping whorl around an axis. Compare conifer. b. a similar structure, as in cycads or club mosses. 5. one of the cone-shaped cells in the retina of the eye, sensitive to bright light and color. Compare rod (def. 11). v.t. 6. to shape like a cone or a segment of a cone. [1480–90; < Latin cōnus < Greek kônos pine cone, cone-shaped figure; akin to hone1] ![]() cone![]() conetop: The volume (V) of a cone can be calculated using the following equation: V = 1/3 πr2h.bottom: detail of the retina showing cones and rodscone (kōn)1. A three-dimensional surface or solid object in which the base is a circle and the sides narrow to form a point. The surface of a cone is formed mathematically by moving a line that passes through a fixed point (the vertex) along a circle.2. A rounded or elongated cluster of woody scales enclosing the reproductive structures of conifers such as pines, spruces, and firs. Cones are either male, producing pollen, or female, bearing seeds. Male cones are much smaller than female cones. When the seeds become mature, the female cones expand to release them.3. One of the cone-shaped cells in the retina of the eye of many vertebrate animals. Cones are responsible for daylight vision and, in some animals, for the ability to see colors. Compare rod.Cone a cone-like shape; used figuratively. See also cock.Examples: cone of flame, 1813; of prelacy, 1641; of rays, 1831; of shade, 1667.cone
Past participle: coned
Gerund: coning
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| I cone | | you cone | | he/she/it cones | | we cone | | you cone | | they cone |
| Preterite |
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| I coned | | you coned | | he/she/it coned | | we coned | | you coned | | they coned |
| Present Continuous |
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| I am coning | | you are coning | | he/she/it is coning | | we are coning | | you are coning | | they are coning |
| Present Perfect |
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| I have coned | | you have coned | | he/she/it has coned | | we have coned | | you have coned | | they have coned |
| Past Continuous |
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| I was coning | | you were coning | | he/she/it was coning | | we were coning | | you were coning | | they were coning |
| Past Perfect |
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| I had coned | | you had coned | | he/she/it had coned | | we had coned | | you had coned | | they had coned |
| Future |
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| I will cone | | you will cone | | he/she/it will cone | | we will cone | | you will cone | | they will cone |
| Future Perfect |
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| I will have coned | | you will have coned | | he/she/it will have coned | | we will have coned | | you will have coned | | they will have coned |
| Future Continuous |
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| I will be coning | | you will be coning | | he/she/it will be coning | | we will be coning | | you will be coning | | they will be coning |
| Present Perfect Continuous |
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| I have been coning | | you have been coning | | he/she/it has been coning | | we have been coning | | you have been coning | | they have been coning |
| Future Perfect Continuous |
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| I will have been coning | | you will have been coning | | he/she/it will have been coning | | we will have been coning | | you will have been coning | | they will have been coning |
| Past Perfect Continuous |
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| I had been coning | | you had been coning | | he/she/it had been coning | | we had been coning | | you had been coning | | they had been coning |
| Conditional |
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| I would cone | | you would cone | | he/she/it would cone | | we would cone | | you would cone | | they would cone |
| Past Conditional |
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| I would have coned | | you would have coned | | he/she/it would have coned | | we would have coned | | you would have coned | | they would have coned |
Thesaurus| Noun | 1. |  cone - any cone-shaped artifact artefact, artifact - a man-made object taken as a whole | | 2. |  cone - a shape whose base is a circle and whose sides taper up to a pointcone shape, conoidround shape - a shape that is curved and without sharp anglesfunnel, funnel shape - a conical shape with a wider and a narrower opening at the two endstip, peak, point - a V shape; "the cannibal's teeth were filed to sharp points" | | 3. |  cone - cone-shaped mass of ovule- or spore-bearing scales or bractsstrobile, strobilusreproductive structure - the parts of a plant involved in its reproductionfir cone - the seed-producing cone of a fir treegalbulus - the seed-producing cone of a cypress treepinecone - the seed-producing cone of a pine treeconifer, coniferous tree - any gymnospermous tree or shrub bearing coneshorsetail - perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South Americaclub moss, club-moss, lycopod - primitive evergreen moss-like plant with spores in club-shaped strobiles | | 4. | cone - a visual receptor cell in the retina that is sensitive to bright light and to colorcone cell, retinal coneretina - the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nervevisual cell - one of the cells of the retina that is sensitive to lightiodopsin - a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision | | Verb | 1. | cone - make cone-shaped; "cone a tire"bevel, chamfer - cut a bevel on; shape to a bevel; "bevel the surface" |
Translationscone (koun) noun1. a solid figure with a point and a base in the shape of a circle or oval. 錐形物 锥形物2. the fruit of the pine, fir etc. fir-cones. 毬果 球果3. a pointed holder for ice cream; an ice-cream cone. (冰淇淋的)甜筒 （盛冰淇淋的）锥形蛋卷筒 4. a warning sign placed next to roadworks etc or where parking is not allowed. 三角錐警告標誌 圆锥形警告标志conical (ˈkonikl) adjective cone-shaped. 圓錐形的 圆锥形的cone
conehead1. A stupid person. Did you hear that guy's ridiculous question? Geez, what a conehead.2. Someone who is very intelligent, but with very narrow interests. Smart as he is, I doubt he'll be able to help you change your tire—he's a real conehead.conehead1. n. a fool; an oaf. You can be pretty much of a conehead yourself sometimes, you know. 2. n. an intellectual; a pointy-head. They build fences around universities to keep the coneheads in. cones n. the breasts; female breasts. She ain’t much in the cones department. See also: conecone
cone or conical surface, in mathematics, surface generated by a moving line (the generator) that passes through a given fixed point (the vertex) and continually intersects a given fixed curve (the directrix). The generator creates two conical surfaces—one above and one below the vertex—called nappes. If the directing curve is a conic sectionconic section
or conic
, curve formed by the intersection of a plane and a right circular cone (conical surface). The ordinary conic sections are the circle, the ellipse, the parabola, and the hyperbola.
..... Click the link for more information. (e.g., a circle or ellipse) the cone is called a quadric cone. The most common type of cone is the right circular cone, a quadric cone in which the directrix is a circle and the line drawn from the vertex to the center of the circle is perpendicular to the circle. The generator of a cone in any of its positions is called an element. The solid bounded by a conical surface and a plane (the base) whose intersection with the conical surface is a closed curve is also called a cone. The altitude of a cone is the perpendicular distance from its vertex to its base. The lateral area is the area of its conical surface. The volume is equal to one third the product of the altitude and the area of the base. The frustum of a cone is the portion of the cone between the base and a plane parallel to the base of the cone cutting the cone in two parts.
cone or strobilus (strŏb`ələs), in botany, reproductive organ of the gymnosperms (the conifersconifer
[Lat.,=cone-bearing], tree or shrub of the order Coniferales, e.g., the pine, monkey-puzzle tree, cypress, and sequoia. Most conifers bear cones and most are evergreens, though a few, such as the larch, are deciduous.
..... Click the link for more information. , cycadscycad
, any plant of the order Cycadales, tropical and subtropical palmlike evergreens. The cycads, ginkgoes, and conifers comprise the three major orders of gymnosperms, or cone-bearing plants (see cone and plant). The cycads first appeared in the Permian period.
..... Click the link for more information. , and ginkgoesginkgo
or maidenhair tree,
tall, slender, picturesque deciduous tree (Ginkgo biloba) with fan-shaped leaves. The ginkgo is native to E China, where it was revered by Buddhist monks and planted near temples.
..... Click the link for more information. ). Like the flower in the angiosperms (flowering plants), the cone is actually a highly modified branch; unlike the flower, it does not have sepals or petals. Usually separate male (staminate, or pollen) cones and female (ovulate, or seed) cones are borne on the same plant. Each of the numerous scales, or sporophylls, of the staminate cone bears pollenpollen,
minute grains, usually yellow in color but occasionally white, brown, red, or purple, borne in the anther sac at the tip of the slender filament of the stamen of a flowering plant or in the male cone of a conifer.
..... Click the link for more information. and each female-cone scale bears ovules in which egg cells are produced. In the pine, a conifer, the staminate cones are small and short-lived; they are borne in clusters at the top of the tree. At the time of pollination, enormous numbers of pollen grains are released and dispersed by wind; those that land accidentally on female-cone scales extend pollen tubes part way into the ovule during one growing season but usually do not reach the stage of actual fertilization until the next year. The cones that are commonly observed are the seed cones, which are normally hard and woody although in a few the scales are fleshy at maturity. The terms strobili and cones are also applied to the comparable and nonseed bearing structures of the horsetails and club mosses.Cone (mathematics). (1) A cone, or conical surface, is the locus of lines (generators) in space that join all the points of a curve (directrix) to a given point (vertex) in space. If the directrix is a line, then the cone reduces to a plane. If the directrix is a curve  Figure 1
of the second degree not lying in the same plane as the vertex, then we obtain a quadric conical surface (see Figure 1, where the directrix is an ellipse). The simplest surface of this type is a circular, or right circular, cone, whose directrix is a circle and whose vertex can be orthogonally projected to the center of the circle.  Figure 2
 Figure 3
(2) In elementary geometry, a circular cone is a geometric solid bounded by the surface of a circular cone and the plane containing the directing circle (Figure 2). Its volume is equal to πr2h/3, and its lateral area to πrl If a cone is cut by a second plane parallel to the first, a frustum of the cone (Figure 3) is obtained, whose volume is equal to π(R2 + r2 + Rr)h/3 and whose lateral area is π(R + r)l. cone[kōn] (botany) The ovulate or staminate strobilus of a gymnosperm. (engineering acoustics) The cone-shaped paper or fiber diaphragm of a loudspeaker. (geology) A mountain, hill, or other landform having relatively steep slopes and a pointed top. (histology) A photoceptor of the vertebrate retina that responds differentially to light across the visible spectrum, providing both color vision and visual acuity in bright light. (mathematics) A solid bounded by a region enclosed in a closed curve on a plane and a surface formed by the segments joining each point of the closed curve to a point which is not in the plane. (metallurgy) The part of an oxygen gas flame adjacent to the orifice of the tip. (textiles) A bobbin on which yarn is wound for weaving. wind cone Wind cone.A free-rotating fabric-truncated cone that when subjected to air movement indicates wind direction and wind force. On approach charts, the wind cone is shown as. Also called a cone, sock, or wind sock.cone1. Mathsa. a geometric solid consisting of a plane base bounded by a closed curve, often a circle or an ellipse, every point of which is joined to a fixed point, the vertex, lying outside the plane of the base. A right circular cone has a vertex perpendicularly above or below the centre of a circular base. Volume of a cone: ⅓πr2h, where r is the radius of the base and h is the height of the cone b. a geometric surface formed by a line rotating about the vertex and connecting the peripheries of two closed plane bases, usually circular or elliptical, above and below the vertex 2. Botanya. the reproductive body of conifers and related plants, made up of overlapping scales, esp the mature female cone, whose scales each bear a seed b. a similar structure in horsetails, club mosses, etc. 3. a small cone-shaped bollard used as a temporary traffic marker on roads 4. Anatomy any one of the cone-shaped cells in the retina of the eye, sensitive to colour and bright light cone
cone [kōn] 1. a solid figure or body having a circular base and tapering to a point.2. one of the conelike structures which, with the rods" >rods, form the light-sensitive elements of the retina; the cones make possible the perception of color. See also eye" >eye and vision" >vision. Called also retinal cone.3. in radiology, a conical or open-ended cylindrical structure formerly used as an aid in centering the radiation beam and as a guide to source-to-film distance. Cones were commonly attached to the x-ray tube prior to the use of the collimator.4. in therapy" >root canal therapy, a solid substance with a tapered form, usually made of gutta-percha or silver, fashioned to conform to the shape of a root canal.ether cone a cone-shaped device used over the face in administration of ether for anesthesia.gutta-percha cone in therapy" >root canal therapy, a plastic radiopaque cone made from gutta-percha and other ingredients, available in standard sizes according to the dimensions of root canal reamers and files; used to fill and seal the canal along with sealer cements. Called also gutta-percha point.cone of light the triangular reflection of light seen on the tympanic membrane.pressure cone the area of compression exerted by a mass in the brain, as in transtentorial herniation.retinal cone cone (def. 2).silver cone silver point.cone (kōn), 1. A surface joining a circle to a point above the plane containing the circle. 2. The photosensitive, outward-directed, conic process of a cone cell essential for sharp vision and color vision; cones are the only photoreceptors in the fovea centralis and become interspersed with increasing numbers of rods toward the periphery of the retina. Synonym(s): cone cell of retina3. Metallic cylinder or truncated cone, either circular or square in cross-section, used to confine a beam of x-rays. Synonym(s): conus (1) [G. kōnos, cone] cone (kōn)n. Physiology One of the photoreceptors in the retina of the eye that is responsible for daylight and color vision. These photoreceptors are most densely concentrated in the fovea centralis, creating the area of greatest visual acuity. Also called cone cell.cone Gynecology Cone biopsy, see there Neurophysiology 1. A color receptor cell in the retina of the eye.2. Growth cone, see there Urogynecology See Vaginal cone.cone (kōn) 1. A surface joining a circle to a point above the plane containing the circle. 2. The photosensitive, outward-directed, conical process of a cone cell essential for sharp vision and color vision; cones are the only photoreceptor in the fovea centralis and become interspersed with increasing numbers of rods toward the periphery of the retina. 3. Metallic cylinder or truncated cone, either circular or square in cross-section, used to confine a beam of x-rays.
Synonym(s): conus (1) . [G. kōnos, cone]cone - (in plants) a reproductive structure in the form of a conical mass of scale-like sporophylls surrounding a central axis, found particularly in GYMNOSPERMS but also in other plant groups, e.g. horsetails (Equisetales).
- (in animals) a light-sensitive structure in the vertebrate eye. See CONE CELL.
cone (kōn) 1. A surface joining a circle to a point above the plane containing the circle. 2. Metallic cylinder or truncated cone used to confine a beam of x-rays. [G. kōnos, cone]CONE
| Acronym | Definition |
|---|
| CONE➣Coalition on the Niagara Escarpment | | CONE➣Console Newsreader and Emailer | | CONE➣Collaborative Observatory for Natural Environments | | CONE➣Cost of New Entry (power industry) | | CONE➣Cryogenic Orbital Nitrogen Experiment | | CONE➣Chess Organizers of New England |
cone
Related to cone: Cone biopsy, Cone eyeSynonyms for conenoun any cone-shaped artifactRelated Wordsnoun a shape whose base is a circle and whose sides taper up to a pointSynonymsRelated Words- round shape
- funnel
- funnel shape
- tip
- peak
- point
noun cone-shaped mass of ovule- or spore-bearing scales or bractsSynonymsRelated Words- reproductive structure
- fir cone
- galbulus
- pinecone
- conifer
- coniferous tree
- horsetail
- club moss
- club-moss
- lycopod
noun a visual receptor cell in the retina that is sensitive to bright light and to colorSynonymsRelated Words- retina
- visual cell
- iodopsin
verb make cone-shapedRelated Words |