‖ Rhynchosaurus|rɪŋkəʊˈsɔːrəs| [mod.L., f.Gr. ῥύγχος snout + σαῦρος lizard.] A genus of edentulous reptiles found in the New Red Sandstone of Shropshire and having prolonged premaxillaries. 1845[see nothosaurus].1851Richardson Geol. (1855) 298 The Rhynchosaurus, from the new red-sandstone of Grinshill.