large tough nonrigid bag filled with gas or heated air
source: WordNet 3.0
small thin inflatable rubber bag with narrow neck
source: WordNet 3.0
A bag made of silk or other light material, and filled with hydrogen gas or heated air, so as to rise and float in the atmosphere; especially, one with a car attached for aërial navigation.
source: Webster 1913
verb
ride in a hot-air balloon
He tried to balloon around the earth but storms forced him to land in China.
