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spicule (n.)

1785, from French spicule, from Latin spiculum, diminutive of spica (see spike (n.2)). Related: Spicular.

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Definitions of spicule

spicule (n.)
small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals;
Synonyms: spiculum
From wordnet.princeton.edu