SINCE 1828
Sipunculoidea
plural noun
Si·pun·cu·loi·dea
| \ (ˌ)sīˌpəŋkyəˈlȯidēə\
Definition of Sipunculoidea
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 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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