SINCE 1828
echiuroid
noun
echi·uroid
| \
ˌe-ki-ˈyu̇r-ˌȯid
\
\
Definition of echiuroid
: any of a phylum (Echiura synonym Echiuroidea) of marine worms of uncertain taxonomic affinities that have a sensitive but nonretractile proboscis above the mouth
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