n. A small South American rodent quadruped of the genus Chinchilla, especially C. lanigera; a pika-squirrel.n. Some related animal of the family Chinchillidæ: as, Cuvier's chinchilla (Lagidium cuvieri).n. The typical genus of the family Chinchillidæ: synonymous with Eriomys.n. The fur of these animals, which is used for tippets, muffs, linings to cloaks, pelisses, etc.n. A thick heavy cloth for women's winter cloaks, with a long napped surface rolled into little tufts, in imitation of chinchilla fur.