Ball Bearing Definition

noun
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.
American Heritage
A bearing in which the moving parts revolve or slide on freely rolling metal balls so that friction is reduced.
Webster's New World
A hard ball used in such a bearing.
American Heritage
Any of such metal balls.
Webster's New World

In engineering, a bearing assembly which uses spherical bearing balls as the rolling elements.

Wiktionary
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Other Word Forms of Ball Bearing

Noun

Singular:
ball bearing
Plural:
ball-bearings

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ball bearing