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Ball bearings

 - 1 dictionary result

ball bearing

–noun Machinery.
1. a bearing consisting of a number of hard balls running in grooves in the surfaces of two concentric rings, one of which is mounted on a rotating or oscillating shaft or the like.
2. any of the balls so used.

Origin:
1880–85


ball-bearing, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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