
Spanish word res comes from Proto-Indo-European *reh₁ís, Proto-Indo-European *(o)reyǝ-, and later Proto-Italic *reis (Thing, matter.)
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*reh₁ís (Proto-Indo-European)
*(o)reyǝ- (Proto-Indo-European)
*reis (Proto-Italic)
Thing, matter.
re (Latin)
About, regarding, with reference to.
res (Spanish)
(Latin America) bovine animal. Head of quadrupedal cattle or game.