lynx (n.) Look up lynx at Dictionary.com
mid-14c., from Latin lynx (source of Spanish, Portuguese, Italian lince), from Greek lyngz, perhaps from PIE *leuk- "light" (see light (n.)), in reference to its gleaming eyes or its ability to see in the dark.
If that men hadden eyghen of a beeste that highte lynx, so that the lokynge of folk myghte percen thurw the thynges that withstonden it. [Chaucer's "Boethius," c. 1380]
Compare Lithuanian luzzis "lynx" and the Germanic cognates, Old High German luhs, German luchs, Old English lox, Dutch los, Swedish lo. A moderate-sized wildcat with a short tail, penciled ears, more or less spotted fur, and 28 teeth, it inhabits Eurasia, Africa, and North America.