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spiculum

noun
spic·​u·​lum | \ -ləm\
plural spicula\ -​lə \

Definition of spiculum

1 : any of various small spicular organs (such as the spines of an echinoderm, the dart of various snails, or a copulatory bristle on a nematode)
2 : spicule

History and Etymology for spiculum

Latin, small sharp organ or part, sting, arrowhead, arrow

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