Pronunciation: (vi-skä'chu),[key] —n. 1. a burrowing rodent, Lagostomus maximus, about the size of a groundhog, inhabiting the pampas of Paraguay and Argentina, allied to the chinchilla.
2. Also called mountain viscacha. a related rodent of the genus Lagidium, of the Andes, about the size of a squirrel, having rabbitlike ears and a squirrellike tail. Also,vizcacha.