ball bearing -
In engineering, a bearing assembly which uses spherical bearing balls as the rolling elements.
ball bearing -
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.
OmegaWiki Dictionary
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ball bearing 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.
