Also called mountain lion, panther, puma. a large, tawny cat, Felis concolor, of North and South America: now greatly reduced in number and endangered in some areas.
2.
Informal. an older woman who seeks sexual relationships with much younger men: He's in his twenties, but he prefers cougars in their forties and fifties to young women his own age.
1774, from Fr. couguar, Buffon's adaption of a word from Port. picked up in Brazil as çuçuarana, perhaps from Tupi susuarana, from suasu "deer" + rana "false." Another proposed source is Guarani guaçu ara. Slang sense of "older woman (35-plus) who seeks younger males as sex partners"