Etymology
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catamount (n.)

1660s as a shortening of cat-o'-mountain (1610s), from cat of the mountain (mid-15c.), a name aplied to various large wild cats of the Old World. From 1794 in reference to the lynx, puma, or cougar of the United States and Canada.

updated on October 18, 2017

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Definitions of catamount from WordNet

catamount (n.)
short-tailed wildcats with usually tufted ears; valued for their fur;
Synonyms: lynx
catamount (n.)
large American feline resembling a lion;
Synonyms: cougar / puma / mountain lion / painter / panther / Felis concolor
From wordnet.princeton.edu, not affiliated with etymonline.