order Sauropterygia or·der·sau·ropterygia uncommon noun 1. extinct marine reptiles: plesiosaurs; nothosaurs SynonymsSauropterygiaorder Sauropterygia Related words Broader terms animal order Parts Archosauria Part of PlesiosauriaNothosauria WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
