spiculum
noun
spic·u·lum
-ləm
plural spicula
-lə
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
Word History
Etymology
Latin, small sharp organ or part, sting, arrowhead, arrow