spicule

spicule
[ˈspɪkjuːl]
noun

(technical)a minute sharp-pointed object or structure that is typically present in large numbers, such as a fine particle of ice
(技)（细小）针状物（常大量出现，如冰屑）
■(Zoology)each of the small needle-like or sharp-pointed structures of calcite or silica which make up the skeleton of a sponge
(动)（海绵的）骨针
(Astronomy)a short-lived, relatively small radial jet of gas in the chromosphere or lower corona of the sun
(天文)针状物

派生
spicular
adjective
spiculate
[-lət]
adjective
spiculation
noun
语源

late 18th cent.: from modern Latin spicula, spiculum, diminutives of spica 'ear of grain'

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