aero-

1. a combining form meaning “air,” used in formation of compound words: aerodrome.

combining form

1. denoting air, atmosphere, or gasaerodynamics
2. denoting aircraftaeronautics

word-forming element meaning “air, atmosphere; aircraft; gasses,” from Greek aero-, comb. form of aer (genitive aeros) “air, lower atmosphere” (see air (n.1)).

pref.

1. Air; atmosphere:aerobic.
2. Gas:aerosol.