Definitions for ball bearing
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Random House Webster's College Dictionary
ball′ bear′ing(n.)
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.
Category: Machinery
a ball so used.
Category: Machinery
Princeton's WordNet
ball bearing, needle bearing, roller bearing(noun)
bearings containing small metal balls
Wiktionary
ball bearing(Noun)
In engineering, a bearing assembly which uses spherical bearing balls as the rolling elements
ball bearing(Noun)
In common usage, an individual spherical ball, usually made of steel or other hard material, suitable for use in a ball-based rolling element bearing
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"ball bearing." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/ball bearing>.