large tough nonrigid bag filled with gas or heated air(noun.artifact)
source: wordnet30
small thin inflatable rubber bag with narrow neck(noun.artifact)
source: wordnet30
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.(noun)
source: webster1913
verb (v)
ride in a hot-air balloon(verb.motion)
Example: He tried to balloon around the earth but storms forced him to land in China.