guy
/ɡaɪ/
An effigy of a man burned on a bonfire on the anniversary of the Gunpowder Plot (5th November).
A person of eccentric appearance or dress; a "fright".
A man, fellow.
(especially in the plural) A person (see usage notes).
(of animals and sometimes objects) Thing, creature.
The dog's left foreleg was broken, poor little guy.
Thing, unit.
This guy is the partial derivative of that guy with respect to x.
(term of address) Buster, Mack, fella, bud, man.
Hey, guy, give a man a break, would ya?