‖Ech′i‐u‐roi″de‐a (?), n. pl. [NL., fr. echiurus, the name of one genus (Gr. ἔχισ an adder + ουρἄ tail) + -oid.] (Zoöl.) A division of Annelida which includes the genus Echiurus and allies. They are often classed among the Gephyrea, and called the armed Gephyreans.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.