Definition of aerostat
: a lighter-than-air aircraft (such as a balloon or blimp) — compare aerodyne
Origin and Etymology of aerostat
French aérostat, from aér- + -stat
First Known Use: 1784
Learn More about aerostat
Seen and Heard
What made you want to look up aerostat? Please tell us where you read or heard it (including the quote, if possible).