Sciuridae sciu·ri·dae uncommon noun 1. true squirrels; ground squirrels; marmots; chipmunks; flying squirrels; spermophiles Synonymsfamily Sciuridae Related words Broader terms mammal family Parts Sciuromorpha Part of squirrelSciurusTamiasciurusCitellusCynomysTamiasEutamiasGlaucomys WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.