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spicule
spic·ule S0636900 (spĭk′yo͞ol) also spic·u·la (-yə-lə)n. pl. spic·ules also spic·u·lae (-yə-lē) 1. A small needlelike structure or part, such as one of the silicate or calcium carbonate processes supporting the soft tissue of certain invertebrates, especially sponges.2. Astronomy A spike-shaped formation emanating from the ionized gas of the solar photosphere.
[Latin spīculum; see spiculum.]
spic′u·lar (-yə-lər), spic′u·late (-yə-lĭt, -lāt′) adj.spicule (ˈspɪkjuːl) n1. (Biology) Also called: spiculum a small slender pointed structure or crystal, esp any of the calcareous or siliceous elements of the skeleton of sponges, corals, etc2. (Astronomy) astronomy a spiked ejection of hot gas occurring over 5000 kilometres above the sun's surface (in its atmosphere) and having a diameter of about 1000 kilometres[C18: from Latin: spiculum] spiculate adjspic•ule (ˈspɪk yul)
n. 1. a small, needlelike crystal, process, or the like. 2. one of the small, hard, calcareous or siliceous bodies that serve as the skeletal elements of various marine and freshwater invertebrates. [1775–85; < Latin spīculum] spic′u•late` (-yəˌleɪt, -lɪt) adj. spic·ule (spĭk′yo͞ol) A needle-like structure or part, such as one of the mineral structures supporting the soft tissue of certain invertebrates, especially sponges.Thesaurus| Noun | 1. |  spicule - small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and coralsspiculumappendage, outgrowth, process - a natural prolongation or projection from a part of an organism either animal or plant; "a bony process" |
TranslationsSpicule
spicule: see chromospherechromosphere
[Gr.,=color sphere], layer of rarefied, transparent gases in the solar atmosphere; it measures 6,000 mi (9,700 km) in thickness and lies between the photosphere (the sun's visible surface) and the corona (its outer atmosphere).
..... Click the link for more information. .Spicule Spicules are spike-like prominences visible at the limb of the sun during solar eclipses or during observation of the sun in monochromatic light, for example, the light of the hydrogen line Hλ. They extend into the solar corona to heights of 6,000–10,000 km and have diameters of 200–2,000 km. The average lifetime of a spicule is 5–7 min. Spicules move upward at speeds of 20–30 km/sec; the speeds of internal movements are 5–10 km/sec. The temperature of a spicule is approximately 8000°K in the lower part and about 16,000°K in the upper part. The density of spicules varies with height from 2 × 1011 to 3 × 1010 atoms/cm3. Hundreds of thousands of spicules exist on the sun at one time. They arise primarily at the edges of the cells of the chromospheric network.
Spicule (1) In certain invertebrates a skeletal element consisting of calcium carbonate or, less commonly, silica (silicon dioxide). Spicules occur in sponges (in the form of one-, three-, four-, and many-rayed needles), octocorallians, aplacophorans, mollusks, holothurians and other echinoderms (in the form of small wheels, anchors, or lattices), and ascidians (in the form of thorny spheres). (2) In nematodes, a part of the male copulatory organ. In some species the spicules are supplementary formations; they protrude from the cloacal opening of the male and serve to widen the female’s vagina. In other species sulcate spicules come together and conduct the spermatozoa into the vagina of the female. spicule[′spik·yül] (astronomy) One of an irregular distribution of jets shooting up from the sun's chromosphere. Also known as solar spicule. (botany) An empty diatom shell. (invertebrate zoology) A calcareous or siliceous, usually spikelike supporting structure in many invertebrates, particularly in sponges and alcyonarians. spicule
spicule [spik´ūl] a sharp, needle-like body or spike.spic·ule (spik'yūl), 1. A small needle-shaped body. 2. Accessory reproductive structure in male nematodes; useful in identification of species. [L. spiculum, dim. of spica, or spicum, a point] spicule (spĭk′yo͞ol) also spicula (-yə-lə)n. pl. spic·ules also spic·ulae (-yə-lē) A small needlelike structure or part, such as one of the silicate or calcium carbonate processes supporting the soft tissue of certain invertebrates, especially sponges.
spic′u·lar (-yə-lər), spic′u·late (-yə-lĭt, -lāt′) adj.spic·ule (spik'yūl) A small, needle-shaped body. [L. spiculum, dim. of spica, or spicum, a point]spicule - a small spiked structure in male nematode worms that assists in copulation.
- a slender rod of calcium carbonate found in sponges, that supports the soft wall.
spic·ule (spik'yūl) A small, needle-shaped body. [L. spiculum, dim. of spica, or spicum, a point]spicule
Related to spicule: sponginSynonyms for spiculenoun small pointed structure serving as a skeletal element in various marine and freshwater invertebrates eSynonymsRelated Words- appendage
- outgrowth
- process
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