suborder Sciuromorpha su·bor·ders·ciuromorpha uncommon noun 1. large more or less primitive rodents: squirrels; marmots; gophers; beavers; etc. SynonymsSciuromorphasuborder Sciuromorpha Related words Broader terms animal order Parts Rodentia Part of HeteromyidaeGeomyidaeSciuridaeCastoridaeAplodontiidae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.