释义 |
perimeter
perimeterthe circumference or outline of a closed figure; outer boundary of an enclosed area: the perimeter of the estate Not to be confused with:parameter – a measurable characteristic; a constant factor serving as a limit; guidelines: the basic parameters of our foreign policype·rim·e·ter P0193300 (pə-rĭm′ĭ-tər)n.1. Mathematics a. A closed line bounding a plane area.b. The length of such a line.2. The outer limits of an area. See Synonyms at circumference.3. A defended boundary protecting a military position.4. Basketball The three-point line. [Middle English perimetre, from Latin perimetros, from Greek : peri-, peri- + metron, measure; see meter2.] per′i·met′ric (pĕr′ə-mĕt′rĭk), per′i·met′ri·cal (-rĭ-kəl) adj.per′i·met′ri·cal·ly adv.perimeter (pəˈrɪmɪtə) n1. (Mathematics) maths a. the curve or line enclosing a plane areab. the length of this curve or line2. a. any boundary around something, such as a fieldb. (as modifier): a perimeter fence; a perimeter patrol. 3. (Medicine) a medical instrument for measuring the limits of the field of vision[C16: from French périmètre, from Latin perimetros; see peri-, -meter] perimetric, ˌperiˈmetrical, peˈrimetral adj ˌperiˈmetrically adv peˈrimetry npe•rim•e•ter (pəˈrɪm ɪ tər) n. 1. the border or outer boundary of a two-dimensional figure. 2. the length of such a boundary. 3. a line marking a boundary. 4. the outermost limits. 5. an instrument for determining the peripheral field of vision. [1585–95; < French périmètre < Latin perimetros (feminine) < Greek perímetron (neuter). See peri-, -meter] pe•rim′e•ter•less, adj. pe•rim′e•tral, per•i•met•ric (ˌpɛr əˈmɛ trɪk) per`i•met′ri•cal, adj. per`i•met′ri•cal•ly, adv. pe•rim′e•try, n. pe·rim·e·ter (pə-rĭm′ĭ-tər)1. The sum of the lengths of the segments that form the sides of a polygon.2. The total length of any closed curve, such as the circumference of a circle.ThesaurusNoun | 1. | perimeter - the boundary line or the area immediately inside the boundarymargin, borderlip - either the outer margin or the inner margin of the aperture of a gastropod's shellbound, boundary, edge - a line determining the limits of an area | | 2. | perimeter - a line enclosing a plane areasline - a length (straight or curved) without breadth or thickness; the trace of a moving point | | 3. | perimeter - the size of something as given by the distance around itcircumferencesize - the physical magnitude of something (how big it is); "a wolf is about the size of a large dog"girth - the distance around a person's body |
perimeternoun boundary, edge, border, bounds, limit, margin, confines, periphery, borderline, circumference, ambit They walked round the perimeter of the stadium. centre, heart, middle, core, nucleus, hub, central partperimeternoun1. A line around a closed figure or area:ambit, circuit, circumference, compass, periphery.2. Chiefly Military. A fairly narrow line or space forming a boundary:border, borderline, brim, brink, edge, edging, fringe, margin, periphery, rim, verge.Translationsperimeter (pəˈrimitə) noun the outside edge of any area. the perimeter of the city; the perimeter of a circle. 邊緣,周圍 边沿,周围
perimeter
perimeter1. Mathsa. the curve or line enclosing a plane area b. the length of this curve or line 2. a medical instrument for measuring the limits of the field of vision perimeter[pə′rim·əd·ər] (mathematics) The total length of a closed curve; for example, the perimeter of a polygon is the total length of its sides. perimeterThe boundary of a system or network, which defines the inside and outside. It is typically determined by firewalls and addresses. See DMZ.perimeter
perimeter [pĕ-rim´ĕ-ter] 1. the boundary of a two-dimensional figure.2. an apparatus for determining the extent of the peripheral visual field.pe·rim·e·ter (pĕ-rim'ĕ-tĕr), 1. A circumference, edge, or border. 2. An instrument, usually half a circle or sphere, used to measure the field of vision. [G. perimetros, circumference, fr. peri, around, + metron, measure] pe·rim·e·ter (pĕ-rim'ĕ-tĕr) 1. A circumference, edge, or border. 2. An instrument, usually half a circle or sphere, used to measure the field of vision. [G. perimetros, circumference, fr. peri, around, + metron, measure]perimeter An instrument for measuring the angular extent and the characteristics (e.g. presence of scotoma) of the visual field. See campimeter; visual field; isopter; tangent screen. arc perimeter Perimeter consisting of a semicircular arc, the inside surface of which is painted matt black or grey. The patient's head is placed such that the eye under investigation is located at the centre of curvature of the arc. The visual field is determined by moving a target along the black surface of the perimeter until the patient either just sees it or just no longer sees it. The targets are small discs of varying colour and size attached to the end of black wands or may be projected on the arc, which can be rotated around the fixation point located at its centre. Thus the visual field can be tested along any meridian. automated perimeter An instrument to test the visual field in which the presentation of the stimuli and the recording are carried out electronically and under the control of a built-in computer. There exist many types (e.g. Henson CFA, Humphrey Field Analyzer, Octopus, Dicon). Computerized perimeters have the following advantages: the examination strategy is reproducible; they can be operated by non-specialists; the testing routine (e.g. number of stimuli or their location) can be altered by modifying the program; each instrument can contain several examination routines aimed at testing various pathologies (e.g. one for glaucoma and another for hemianopic defects); the computer capacity can be used for quantifying the results as, for example, in the Henson CFA where the visual fields can be classified as normal, suspect or defective on the basis of a system included in the instrument (Fig. P7). Syn. computerized perimetry. See Swedish Interactive Thresholding Algorithm; frequency doubling perimetry; short wavelength automated perimetry; Esterman test. bowl perimeter See Goldmann perimeter. Goldmann perimeter Perimeter consisting of a hemispherical bowl, the inside radius of which is 30 cm. Targets of varying intensity and size are projected onto the inside white surface. The background luminance of the bowl is also controlled. In addition there is a telescope attached to the back of the bowl through which the practitioner can verify that the patient maintains fixation. Goldmann perimeter can be used either for kinetic or static perimetry, although it is more appropriately designed for the former. Syn. bowl perimeter. See kinetic perimetry; static perimetry. projection perimeter A perimeter in which the target is projected either onto an arc or a bowl such as the Goldmann perimeter." >Fig. P7 Computerized perimeter. (Humphrey Field Analyzer, Humphrey Instruments, Incperimeter
Synonyms for perimeternoun boundarySynonyms- boundary
- edge
- border
- bounds
- limit
- margin
- confines
- periphery
- borderline
- circumference
- ambit
Antonyms- centre
- heart
- middle
- core
- nucleus
- hub
- central part
Synonyms for perimeternoun a line around a closed figure or areaSynonyms- ambit
- circuit
- circumference
- compass
- periphery
noun a fairly narrow line or space forming a boundarySynonyms- border
- borderline
- brim
- brink
- edge
- edging
- fringe
- margin
- periphery
- rim
- verge
Synonyms for perimeternoun the boundary line or the area immediately inside the boundarySynonymsRelated Wordsnoun a line enclosing a plane areasRelated Wordsnoun the size of something as given by the distance around itSynonymsRelated Words |