small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals
spicule的用法和樣例：
例句
用作名詞 (n.)
Magnetic flux tubes that tilted away from the vertical can focus and guide the rising material up into the solar atmosphere to form a spicule. 被垂直掀動的磁流管可能聚集並引導物質上升進入大氣層內形成針狀體。
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