1. small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut; [syn: peanut worm, sipunculid]
WordNet (r) 3.0 (2006):
sipunculid
n 1: small unsegmented marine worm that when disturbed retracts
its anterior portion into the body giving the appearance of
a peanut [syn: peanut worm, sipunculid]