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n.1.(Paleon.) A genus of extinct marine reptiles, allied to the Mosasaurus. See Illust. in Appendix.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Clidastes, pictured above with Dr Michael Bassett, keeper of Geology, is a type of Mosasaur that dates from around 80 million years ago.