spicule

American  

[spik-yool] / ˈspɪk jul /

noun

1. a small or minute, slender, sharp-pointed body or part; a small, needlelike crystal, process, or the like.

2. Zoology. one of the small, hard, calcareous or siliceous bodies that serve as the skeletal elements of various marine and freshwater invertebrates.

3. Astronomy. a jet of gas several hundred miles in diameter rising from the sun's surface to heights of 3,000 to 6,000 miles (4,800 to 9,600 km).

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spicule British  

/ ˈspɪkjuːl, -lɪt, ˈspɪkjʊˌleɪt /

noun

1. Also called: spiculum.  a small slender pointed structure or crystal, esp any of the calcareous or siliceous elements of the skeleton of sponges, corals, etc

2. 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

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spicule Scientific  

/ spĭk′yo̅o̅l /

1. A needlelike structure or part, such as one of the mineral structures supporting the soft tissue of certain invertebrates, especially sponges.

2. Any of numerous short-lived vertical jets of hot gas rising from the solar chromosphere and extending into the corona. Spicules, which only last for about five to ten minutes, are usually several hundred kilometers wide and several thousand kilometers high.

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Other Word Forms

• spiculate
  adjective

Etymology

Origin of spicule

First recorded in 1775–85; from Latin spīculum “spearhead, arrowhead, bee stinger,” equivalent to spīc(a) “ear of grain” + -ulum diminutive suffix; see spica, -ule

Example Sentences

See Examples For:

spicule

They lack many of the animal’s most distinct and fossil-friendly features, including mineralized skeletons and skeleton-like spicule structures.

From New York Times ● Jul. 28, 2021

Spiraster, spī-ras′tėr, n. in sponges, a short curved axial rod-like spicule with thick spines.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

Carter, "On the nature of the seed-like body of Spongilla; on the origin of the mother-cell of the spicule; and on the presence of spermatozoa in the Spongida," Ann.

From Freshwater Sponges, Hydroids & Polyzoa by Annandale, Nelson

Tylote, tī′lōt, n. a cylindrical spicule, knobbed at both ends.—adj.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

Gemmule-spicules cylindrical, blunt or abruptly pointed, nearly straight, covered with relatively stout, straight, irregular spines, which are equally distributed all over the spicule.

From Freshwater Sponges, Hydroids & Polyzoa by Annandale, Nelson