The Collaborative International Dictionary of English v.0.48:
chinchillon \chinchillon\ n. a gregarious burrowing rodent (Lagostomus maximus) larger than the chinchillas. Syn: viscacha, Lagostomus maximus. [WordNet 1.5] ChinchonaWordNet (r) 3.0 (2006):
Lagostomus maximus n 1: gregarious burrowing rodent larger than the chinchillas [syn: viscacha, chinchillon, Lagostomus maximus]