probably from its former use as a substitute for castoreum in medicine
cat
noun, often attributive
\ˈkat\
a carnivorous mammal (Felis catus) long domesticated as a pet and for catching rats and mice
any of a family (Felidae) of carnivorous usually solitary and nocturnal mammals (such as the domestic cat, lion, tiger, leopard, jaguar, cougar, wildcat, lynx, and cheetah)
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Definition (Entry 1 of 3)
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History and Etymology
probably from its former use as a substitute for castoreum in medicine
cat
noun, often attributive
\ˈkat\
a carnivorous mammal (Felis catus) long domesticated as a pet and for catching rats and mice
any of a family (Felidae) of carnivorous usually solitary and nocturnal mammals (such as the domestic cat, lion, tiger, leopard, jaguar, cougar, wildcat, lynx, and cheetah)