'Eosaurus' definitions:

Definition of 'Eosaurus'

From: GCIDE

Eosaurus \E`o*sau"rus\, n. [NL., fr. Gr. 'hw`s dawn + say^ros lizard.] (Paleon.) An extinct marine reptile from the coal measures of Nova Scotia; -- so named because supposed to be of the earliest known reptiles. [1913 Webster]