The Collaborative International Dictionary of English v.0.48:

Lynx \Lynx\ (l[i^][ng]ks), n. [L. lynx, lyncis, Gr. ly`gx; akin
   to AS. lox, G. luchs, prob. named from its sharp sight, and
   akin to E. light. See Light, n., and cf. Ounce an
   animal.]
   1. (Zool.) Any one of several species of feline animals of
      the genus Felis, and subgenus Lynx. They have a short
      tail, and usually a pencil of hair on the tip of the ears.
      [1913 Webster]

   Note: Among the well-known species are the European lynx
         (Felis borealis); the Canada lynx or loup-cervier
         (Felis Canadensis syn. Lynx lynx); the bay lynx of
         America (Felis rufa), and its western spotted variety
         (var. maculata); and the pardine lynx (Felis pardina)
         of Southern Europe.

   2. (Astron.) One of the northern constellations.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bay \Bay\ (b[=a]), a. [F. bai, fr. L. badius brown,
   chestnut-colored; -- used only of horses.]
   Reddish brown; of the color of a chestnut; -- applied to the
   color of horses.
   [1913 Webster]

   Bay cat (Zool.), a wild cat of Africa and the East Indies
      (Felis aurata).

   Bay lynx (Zool.), the common American lynx (Lynx lynx,
      formerly Felis rufa or Lynx rufa).
      [1913 Webster]