The Collaborative International Dictionary of English v.0.48:

Tayra \Tay"ra\, n. [From the native name.] (Zool.)
   A South American carnivore (Galera barbara) allied to the
   grison. The tail is long and thick. The length, including the
   tail, is about three feet. [Written also taira.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

tayra
    n 1: long-tailed arboreal mustelid of Central America and South
         America [syn: tayra, taira, Eira barbara]