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Longman Dictionary of Contemporary English
aero-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ aeronautics
The Collaborative International Dictionary
Aero-

Aero- \A"["e]r*o-\ [Gr. ?, ?, air.] The combining form of the Greek word meaning air.

Douglas Harper's Etymology Dictionary
aero-

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

Wiktionary
aero-

pre. (non-gloss definition: Denoting a connection to air or aircraft.)