Source : Webster's Revised Unabridged Dictionary (1913)

Aperea \A*pe"re*a\, n. [Native name.] (Zo["o]l.)
   The wild Guinea pig of Brazil ({Cavia aperea}).

Source : WordNet®

aperea
     n : South American cavy; possibly ancestral to the domestic
         guinea pig [syn: {wild cavy}, {Cavia porcellus}]