/ Dictionary / Index E echiuroid: Meaning and Definition of Find definitions for: ech•i•u•roid Pronunciation: (ek"ē-yoor'oid), [key] — n. 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. belonging or pertaining to the Echiuroidea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. echiurid echo Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language