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Latin word equus comes from Proto-Indo-European *h₁eḱus, Proto-Indo-European *h₁oh₁ḱus, Proto-Indo-European *h₁oh₁ḱu-, Proto-Indo-European *h₁eḱ-, and later Proto-Italic *ekwos (Horse.)
*h₁eḱus (Proto-Indo-European)
*h₁oh₁ḱus (Proto-Indo-European)
*h₁oh₁ḱu- (Proto-Indo-European)
*h₁eḱ- (Proto-Indo-European)
*h₁éḱus (Proto-Indo-European)
*ekwos (Proto-Italic)
Horse.
equus (Latin)
A horse. A steed, charger.