WordWeb Online

1. Large tough nonrigid bag filled with gas or heated air
    
2. Small thin inflatable rubber bag with narrow neck

1. Ride in a hot-air balloon
   "He tried to balloon around the earth but storms forced him to land in China"
    
2. Become inflated
   "The sails ballooned";
   - inflate, billow

Derived forms: ballooning, ballooned, balloons

Type of: aviate, expand, fly, lighter-than-air craft, pilot, plaything, toy

Encyclopedia: Balloon