AEROSTAT

Noun

aerostat (plural aerostats)

An aircraft, such as a dirigible or balloon, that derives its lift from buoyancy rather than from wings or rotors.

A moored balloon flown in a semi-permanent manner, such as a border patrol monitoring balloon affixed at 18,000 feet (~6 km).

Antonyms

• (lighter-than-air craft, with respect to its weight relationship with air): aerodyne

Source: Wiktionary

A"ër*o*stat (, n. Etym: [F. aérostat, fr. Gr. Statics.]

1. A balloon.

2. A balloonist; an aëronaut.

Source: Webster’s Unabridged Dictionary 1913 Edition