viscacha UK /vɪˈskatʃə/US /vɪˈskɑt͡ʃə/ noun1 •Any of the several South American rodents, native to the Andes Mountains, of the genera Lagidium and Lagostomus.The guanaco, the viscacha, and the hare of the Pampas, are found in Patagonia. — 1837 formsviscachas