family Megalosauridae fa·mi·ly·megalosauridae uncommon noun 1. an African clawed frog; in some classifications made the type genus of a separate family Xenopodidae SynonymsMegalosauridaefamily Megalosauridae Related words Broader terms reptile family Parts Theropoda Part of genus Megalosaurus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.