The Collaborative International Dictionary of English v.0.48:

Sarlac \Sar"lac\, Sarlyk \Sar"lyk\, n. [Mongolian sarlyk.]
   (Zool.)
   The yak.
   [1913 Webster] Sarmatian

The Collaborative International Dictionary of English v.0.48:

Yak \Yak\ (y[a^]k), n. [Tibetan gyag.] (Zool.)
   A bovine mammal (Poephagus grunnies) native of the high
   plains of Central Asia. Its neck, the outer side of its legs,
   and its flanks, are covered with long, flowing, fine hair.
   Its tail is long and bushy, often white, and is valued as an
   ornament and for other purposes in India and China. There are
   several domesticated varieties, some of which lack the mane
   and the long hair on the flanks. Called also chauri gua,
   grunting cow, grunting ox, sarlac, sarlik, and
   sarluc.
   [1913 Webster]

   Yak lace, a coarse pillow lace made from the silky hair of
      the yak.
      [1913 Webster]