Dictionarybal•loonPronunciation: (bu-lOOn'), [key] —n. 1. a bag made of thin rubber or other light material, usually brightly colored, inflated with air or with some lighter-than-air gas and used as a children's plaything or as a decoration. 2. a bag made of a light material, as silk or plastic, filled with heated air or a gas lighter than air, designed to rise and float in the atmosphere and often having a car or gondola attached below for carrying passengers or scientific instruments. 3. (in drawings, cartoons, etc.) a balloon-shaped outline enclosing words represented as issuing from the mouth of the speaker. 4. an ornamental ball at the top of a pillar, pier, or the like. 5. a large, globular wineglass. 6. Chem. Now Rare.a round-bottomed flask. —v.i. 1. to go up or ride in a balloon. 2. to swell or puff out like a balloon. 3. to multiply or increase at a rapid rate: Membership has ballooned beyond all expectations. —v.t. to fill with air; inflate or distend (something) like a balloon. —adj. 1. puffed out like a balloon: balloon sleeves. 2. Finance.(of a loan, mortgage, or the like) having a payment at the end of the term that is much bigger than previous ones. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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