Home › Words › M › mesosaurmesosaurmesosaur means any of a group of small aquatic reptiles, from the early Permian period, of the order †Mesosauria.EtymologyFrom meso- + -saur.nounAny of a group of small aquatic reptiles, from the early Permian period, of the order †Mesosauria.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.eosuchian 65% match — Any reptile of the order †Eosuchia vs mesosaur →eosauropterygian 64% match — Any extinct reptile of the order Eosauropterygia vs mesosaur →plesiosaur 64% match — Any of the order †Plesiosauria of extinct marine reptiles, from the Jurassic and Cretaceous periods. vs mesosaur →metoposaur 64% match — Any extinct temnospondyl of the genus †Metoposaurus vs mesosaur →ichthyosaur 63% match — Any fishlike marine reptiles of the extinct order †Ichthyosauria of the early Triassic to the late Cretaceous period, that had a body somewhat like a porpoise. vs mesosaur →mesoeucrocodyle 63% match — Any crocodylian of the extinct clade †Mesoeucrocodylia. vs mesosaur →phytosaurian 62% match — Any of the order †Phytosauria of extinct crocodilian-like archosauriforms or basal archosaurians from the Late Triassic. vs mesosaur →ichthyosauromorph 62% match — Any extinct marine reptile of the clade †Ichthyosauromorpha vs mesosaur →