plural noun Si·pun·cu·loi·dea \(ˌ)sīˌpəŋkyəˈlȯidēə\

Definition of Sipunculoidea

  1. 1 :  a group of marine worms of obscure systematic position that are commonly classed as a division of Gephyrea and that lack setae and have the mouth at the end of a retractile introvert similar to a proboscis and usually provided with tentacles and the anus anterior and dorsal

  2. 2 in some classifications a :  a group coextensive with Gephyrea b :  a class or other group comprising Sipunculoidea (see sense 1 above) and Priapuloidea

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Origin and Etymology of sipunculoidea

New Latin, from Sipunculus, genus of marine worms (from Latin sipunculus, siphunculus little pipe) + -oidea — more at siphuncle

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