'Ichthyopsida' definitions:

Definition of 'Ichthyopsida'

From: GCIDE

Ichthyopsida \Ich`thy*op"si*da\, n. pl. [NL., fr. Gr. 'ichqy`s, -y`os, a fish + ? appearance.] (Zool.) A grand division of the Vertebrata, including the Amphibia and Fishes. [1913 Webster]