balloon

v. puff up, expand, grow larger; inflate, fill with air

n. light bag-shaped construction filled with a gas which is lighter than air; airship; inflated rubber ball (used in games); explanation box which appears when the cursor points at a button (Computers)

This article is about balloons in general. See also Balloon (aircraft) and Toy balloon. A balloon is a flexible bag normally filled with a gas, such as helium, hydrogen, nitrous oxide or air. Early balloons were made of dried animal bladders. Modern balloons can be made from materials such as rubber, latex, polychloroprene or a nylon fabric. Some balloons are purely decorative, while others are used for specific purposes such as meteorology, medical treatment, military defense, or transportation. A balloon's properties, including its low density and relatively low cost, have led to a wide range of applications.
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Bal·loon n. An inflatable spherical device that is inserted into a body cavity or structure and distended with air or gas for therapeutic purposes. [more]Balloon - Community and Resources

Noun
1. small thin inflatable rubber bag with narrow neck
(hypernym) plaything, toy
2. large tough non-rigid bag filled with gas or heated air
(hypernym) lighter-than-air craft
(hyponym) hot-air balloon
(part-meronym) envelope, gasbag
Verb
1. ride in a hot-air balloon; "He tried to balloon around the earth but storms forced him to land in China"
(hypernym) fly, aviate, pilot
(derivation) balloonist
2. become inflated; "The sails ballooned"
(synonym) inflate, billow
(hypernym) expand
(hyponym) reflate

n. hot-air balloon, large balloon that is attached to a basket-type carriage and is elevated and propelled through the air by the lightness of the hotair in the balloon which is heated by a torch