tío

uncle (the brother, brother-in-law, or male cousin or cousin-in-law of either parent); unknown or any male person, dude, guy; friend, mate, pal, man, bro; mister (title conferred on an adult male)

“Mi tío es el hermano o primo de mi madre o de mi padre.” — My uncle is my mother’s or father’s brother or male cousin.

Inherited from Old Spanish tio, from Late Latin thius, from Ancient Greek θεῖος (theîos). Compare Italian zio, Galician tío and Portuguese tio, Sardinian tiu.