‖Ich′thy‐op″si‐da (?), n. pl. [NL., fr. Gr. ιχθὔσ, -ύοσ, a fish + � appearance.] (Zoöl.) A grand division of the Vertebrata, including the Amphibia and Fishes.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.