Definition of: acicula

(ə·sik′yə·lə) noun plural ·lae (-lē)
1. A slender needlelike process; a bristle or prickle, as on a plant or animal.
2. A needle-shaped body, as some crystals. [<L, dim. of acus needle]
—a·cic′u·lar, a·cic′u·late (-lit, -lā t), a·cic′u·lat′ed adjective