n. [ F. aérostat, fr. Gr. &unr_; air + &unr_; placed. See Statics. ] 1. (Aëronautics) A balloon, especially a passive balloon; a balloon without motive power. Contrasted with aerodyne. [ 1913 Webster +Webster 1913 Suppl. ]

2. A balloonist; an aëronaut. [ 1913 Webster ]

{ } a. [ Aëro- + Gr. &unr_;: cf. F. aérostatique. See Statical, Statics. ] 1. Of or pertaining to aërostatics; pneumatic. [ 1913 Webster ]

2. Aëronautic; as, an aërostatic voyage. [ 1913 Webster ]

n. The science that treats of the equilibrium of elastic fluids, or that of bodies sustained in them. Hence it includes aëronautics. [ 1913 Webster ]

n. [ Cf. F. aérostation the art of using aërostats. ] 1. That part of aëronautics that deals with passive balloons; the art of raising and guiding balloons in the air. [ 1913 Webster +Webster 1913 Suppl. ]

2. The science of weighing air; aërostatics. [ Obs. ] [ 1913 Webster ]