n.1.(Paleon.) An extinct marine reptile from the coal measures of Nova Scotia; - so named because supposed to be of the earliest known reptiles.
References in periodicals archive ?
382) remarked with his trademark insight and restraint on the uncanny resemblance of Eosaurus to the Mesozoic marine reptile Ichthyosaurus.
What looks like a flower forest of Rousseau's is a nice vulgar expanse of Sears Roebuck linoleum, across which a bug makes his way, as important as an eosaurus traversing Yucatan.