Balloon

A flexible, nonporous bag inflated with a gas, such as helium, that is lighter than the surrounding air, that causes the bag to rise and float in the atmosphere. A large bag of helium gas is need to lift the weather balloons.
2. Such a bag with sufficient capacity to lift a suspended gondola or other payload. Hot air balloons can carry a gondola with people for many miles.
3. Any of variously shaped, brightly colored inflatable rubber bags used as toys. Children love to get balloons at parties.
4. A rounded or irregular shaped outline containing the words that a character in a cartoon is represented to be saying. Cartoonist have been using balloons for many tears.