Source : Webster's Revised Unabridged Dictionary (1913)

Veretillum \Ver`e*til"lum\, n. [L., dim. of veretrum the private
   parts.] (Zo["o]l.)
   Any one of numerous species of club-shaped, compound
   Alcyonaria belonging to {Veretillum} and allied genera, of
   the tribe Pennatulacea. The whole colony can move about as if
   it were a simple animal.