Noun: sipunculid sI'púng-kyu-lid
- Small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut
"Researchers studied the unique retraction behaviour of sipunculids";
- peanut worm
Derived forms: sipunculids
Type of: invertebrate
Part of: phylum Sipuncula, Sipuncula
Encyclopedia: Sipunculid