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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.


ball bearing

noun

  1. a bearing consisting of a number of hard steel balls rolling between a metal sleeve fitted over the rotating shaft and an outer sleeve held in the bearing housing, so reducing friction between moving parts while providing support for the shaft
  2. a metal ball, esp one used in such a bearing


ball bearing

  1. 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.
  2. A hard ball used in such a track.


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Other Words From

  • ball-bearing adjective
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Word History and Origins

Origin of ball bearing1

First recorded in 1880–85
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Example Sentences

The Speed Rope Pro’s ergonomic rubber handles and super smooth ball bearings will allow you to crank out double-unders with ease.

If so, be sure you use ball-bearing grease and not ordinary cup grease.

So that they cannot be injured by waste oil from the ball bearing, or by water or snow.

The days went by on golden, noiseless, ball-bearing axles—and almost before I realized it, winter was upon the land.

It should be a good machine having hard rubber rollers, ball-bearing action, and strong springs at the side.

When he punched that key, if everything worked right, the energy in the tiny ball bearing would be released instantaneously.

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