| genus nothosaurus | (n) a genus of Nothosauria |
| nothosaur | (n) extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming |
| nothosauria | (n) a suborder of Sauropterygia, Syn. suborder Nothosauria |
| nothosaur | n. An extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming. [ WordNet 1.5 ] |