Emily Dickinson Lexicon

YAK, n.

A ruminant mammal of the bovine tribe, the Bos Poephagus, or Bison Poephagus; a species of ox, with cylindric horns curving outward, long pendent hair, and villous, horse-like tail; the grunting ox of Pennant. This ox is found in Thibet. – Cyc.