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exercise ball

noun
1.
a firm, very large, usually inflatable ball used in various exercises, chiefly to strengthen the back, pelvis, and abdominal muscles.
Also called stability ball, balance ball, fitness ball.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for stability ball
noun

any of variously sized large balls used for doing exercises and for physical therapy

Examples

The stability ball is also called a balance ball, birth ball, body ball, exercise ball, fitness ball, gym ball, gymnastic ball, physioball, sports ball, Swedish ball, or therapy ball.

Word Origin

1995

Dictionary.com's 21st Century Lexicon
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Word Value for stability

14
15
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Nearby words for stability ball