chinchillaPronunciation: /tʃɪnˈtʃɪlə/Definition of chinchilla noun 1a small South American rodent with soft grey fur and a long bushy tail. Genus Chinchilla, family Chinchillidae: two species 2a cat or rabbit of a breed with silver-grey or grey fur. 3 [mass noun] the highly valued fur of the chinchilla, or of the chinchilla rabbit. Origin: early 17th century: from Spanish, from Aymara or Quechuachinchilla in other Oxford dictionaries Definition of chinchilla in the US English dictionary