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ichthyosaurus

Ichthyosaurus is a 13 letter word which starts with the letter I and ends with the letter S for which we found 1 definitions.

Definition
(n.) 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.
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