spicule

spicule

[spik-yool]
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 3000 to 6000 miles (4800 to 9600 km).

Origin:
1775–85; < Latin spīculum spearhead, arrowhead, bee stinger, equivalent to spīc(a) ear of grain (see spica) + -ulum -ule

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World English Dictionary
spicule (ˈspɪkjuːl)
 
n
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
 
[C18: from Latin: spiculum]
 
spiculate
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

spicule spic·ule (spĭk'yōōl) or spic·u·la (-yə-lə)
n. pl. spic·ules or spic·u·lae (-yə-lē)
A needlelike structure or part.


spic'u·lar (-yə-lər) or spic'u·late (-yə-lĭt, -lāt') adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
spicule   (spĭk'yl)  Pronunciation Key 
  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.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

spicule

a jet of dense gas ejected from the Sun's chromosphere. Spicules occur at the edges of the chromospheric network, where magnetic fields are stronger. They extend up to 10,000 km (6,000 miles) and, although they fall back to the Sun, are thought to contribute to the solar wind by feeding material into the corona

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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