Webster's Revised Unabridged Dictionary · 1913

Aero

Aero , noun

An aeroplane, airship, or the like. [Colloquial in 1900, now obsolescent.]

Aero , adjective

of or pertaining to aeronautics or aircraft.

Aero-

[Greek {not transcribed}, {not transcribed}, air.]

The combining form of the Greek word meaning air.