/ek'ee yoor"oyd/ , n.
1. any 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.
2. belonging or pertaining to the Echiuroidea.
[ 1885-90; Echiuroidea; see ECHIURID, -OIDEA ]