Ich`thy*o*sau"rus (?), n.; pl. Ichthyosauri (#). [NL., fr. Gr. 'ichqy`s, -y`os, a fish + say^ros a lizard.] Paleon.

An extinct genus of marine reptiles; -- so named from their short, biconcave vertebrae, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oolitic, and Cretaceous formations.

 

© Webster 1913.

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