The Collaborative International Dictionary of English v.0.48:
Aplodontiidae \Aplodontiidae\ n. 1. 1 a family of mammals comprising the mountain beavers. Syn: family Aplodontiidae. [WordNet 1.5]WordNet (r) 3.0 (2006):
Aplodontiidae n 1: mountain beavers [syn: Aplodontiidae, family Aplodontiidae]