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aerology
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aerostat

aer·o·stat [ érrō stàt ] (plural aer·o·stats)


noun 
Definition:
 
aircraft lighter than air: a hot-air or gas-filled aircraft, e.g. a blimp or balloon

[Late 18th century. < French aérostat< aéro- (< Greek aēr "air") + Greek statos "standing"]

aer·o·stat·ic [ èrrō státtik ] adjective
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