Etymology
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aero- 

word-forming element meaning "air, atmosphere; gases," in 20c. use with reference to aircraft or aviation, from Greek aēr (genitive aeros) "air, lower atmosphere" (see air (n.1)).

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pneumato- 
before vowels pneumat-, word-forming element meaning "wind, air, spirit, presence of air," from Greek pneuma (genitive pneumatos) "the wind," also "breath" (see pneuma).
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