spic·ule (spĭk'yōōl) n.
pl.spic·ules also spic·u·lae (-yə-lē) A small needlelike structure or part, such as one of the silicate or calcium carbonate processes supporting the soft tissue of certain invertebrates, especially sponges.
[Latin spīculum; see spiculum.] spic'u·lar (-yə-lər), spic'u·late (-yə-lĭt, -lāt') adj.