A balloon is a colorful bit of rubber that can be blown up or filled with helium. Many children's parties are decorated with balloons.

While most balloons are round, they come in many sizes and shapes. Balloon artists twist long, thin balloons together to form animals, hats, and other items, and Mylar balloons are made from a kind of thin, metallic paper. Much larger balloons include hot air balloons and weather balloons. In the 1500s, balloon was a game played with a leather ball, from the Italian pallone, "large ball."

Definitions of balloon
  1. noun
    small thin inflatable rubber bag with narrow neck
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    type of:
    plaything, toy
    an artifact designed to be played with
  2. noun
    large tough nonrigid bag filled with gas or heated air
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    hot-air balloon
    balloon for travel through the air in a basket suspended below a large bag of heated air
    meteorological balloon
    a small unmanned balloon set aloft to observe atmospheric conditions
    trial balloon
    a balloon sent up to test air currents
    pilot balloon
    meteorological balloon used to observe air currents
    type of:
    lighter-than-air craft
    aircraft supported by its own buoyancy
  3. verb
    become inflated
    “The sails ballooned
    synonyms: billow, inflate
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    become inflated again
    type of:
    become larger in size or volume or quantity
  4. verb
    ride in a hot-air balloon
    “He tried to balloon around the earth but storms forced him to land in China”
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    type of:
    aviate, fly, pilot
    operate an airplane
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