aerostat
/ˈɛroʊstæt/
noun
- A lighter-than-air aircraft, such as a balloon or airship, that stays aloft by using gas that is lighter than air.
- Aerostats are often used for surveillance because they can stay in one place for a long time.
- The museum displayed an old aerostat that was used for military observation in the past.
- The hot air balloon is a type of aerostat that uses heated air to rise.
Antonyms