WordReference Random House Unabridged Dictionary of American English © 2025
ech•i•u•roid
(ek′ē yŏŏr′oid),USA pronunciation n.
adj.
- Invertebratesany wormlike invertebrate of the phylum Echiuroidea, found in sand and mud of tropical and subtropical seas, having at the mouth a ciliated, often elongated prostomium.
adj.
- Invertebratesbelonging or pertaining to the Echiuroidea.
- Neo-Latin Echiuroidea; see echiurid, -oidea
- 1885–90