Definition of aerostat noun from the Oxford Advanced Learner's Dictionary

 

aerostat

 noun
noun
BrE BrE//ˈeərəstæt//
 
; NAmE NAmE//ˈerəstæt//
 
(specialist)
 
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an aircraft such as an airship or hot-air balloon that is filled with a gas Word Origin late 18th cent.: from French aérostat, from Greek aēr ‘air’ + statos ‘standing’.
See the Oxford Advanced American Dictionary entry: aerostat