From The Collaborative International Dictionary of English v.0.48:

Veretillum \Ver`e*til"lum\, n. [L., dim. of veretrum the private
   parts.] (Zool.)
   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.
   [1913 Webster] Vergalieu
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