Etymology
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panther (n.)

mid-13c., panter, another name for the leopard, from Old French pantere "panther" (12c.) and directly from Latin panthera, from Greek panther "panther, leopard," probably of Oriental origin. An ancient folk-etymology derivation from Greek pan- "all" + thēr "beast" led to many curious fables. The word was applied to the American cougar or puma by 1730.

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Definitions of panther

panther (n.)
a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis;
Synonyms: jaguar / Panthera onca / Felis onca
panther (n.)
a leopard in the black color phase;
panther (n.)
large American feline resembling a lion;
Synonyms: cougar / puma / catamount / mountain lion / painter / Felis concolor
From wordnet.princeton.edu