\A"["e]r*o*stat\, n. [F. a['e]rostat, fr. Gr. ? air + ?
placed. See {Statics}.]
1. A balloon.
2. A balloonist; an a["e]ronaut.

\A"["e]r*o*stat\, n. (A["e]ronautics)
A passive balloon; a balloon without motive power.