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Spanish word oso comes from Proto-Indo-European *h₂ŕ̥tḱos (Bear.)
*h₂ŕ̥tḱos (Proto-Indo-European)
Bear.
*orssos (Proto-Italic)
Bear.
ursus (Latin)
A bear.
*ussus (Vulgar Latin)
osso (Old Spanish)
Bear.
oso (Spanish)
(slang) bear (large hairy man, especially homosexual). Bear.