an invertebrate of the phylum Sipuncula, comprising the peanut worms.
adjective
belonging or pertaining to the sipunculids.
Origin of sipunculid
1885–90; originally a member of the family Sipunculidae < New Latin, equivalent to Sipuncul(us) a genus (Latin: variant of sīphunculus; see siphuncle) + -idae-id2
