Ball-bearing definition

A friction-reducing bearing consisting essentially of a ring-shaped track containing freely revolving hard metal balls against which a rotating shaft or other part turns.
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A hard ball used in such a bearing.
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A bearing in which the moving parts revolve or slide on freely rolling metal balls so that friction is reduced.
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Any of such metal balls.
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A ring-shaped track containing hard metal balls that roll freely, used to reduce friction where a rotating element (such as an axle) is attached to a fixed point.
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A hard ball used in such a track.
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In engineering, a bearing assembly which uses spherical bearing balls as the rolling elements.
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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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Alternative Forms

Alternative Form of ball-bearing - ballbearing

Other Word Forms

Noun

Singular:
ball-bearing
Plural:
ball-bearings