プレシオサウルスalso: プレシオザウルスプレシオサウルスMeanings1nounplesiosaurusRefers to the extinct marine reptile of the Mesozoic era. Used in paleontology and popular science contexts.博はく物ぶつ館かんでプレシオサウルスの化か石せきを見みた。I saw a plesiosaurus fossil at the museum.
