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echiuroid

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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

Origin and Etymology of echiuroid

New Latin Echiuroidea or Echiura, ultimately from Greek echis viper + oura tail

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First Known Use: circa 1889

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