clavula

from The Century Dictionary.

• noun . In botany, the elongated clavate portion of the receptacle in certain fungi.
• noun In zoöl.:
• noun One of the ciliated clavate setæ or knobbed bristles found on the fascioles of sea-urchins, as spatangoids.
• noun In sponges, a rod-like spicule pointed at one end and having a knob or disk at the other; a tylotate or knobbed rhabdus.
• noun Also clavule.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A ciliated bristle of some sea urchins
• noun A spicule of some sponges