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