ball bearing

noun Machinery.
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.
any of the balls so used.


ball-bearing, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ball bearing
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
ball bearing  

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  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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Generators had a ball bearing on one end of the armature and a bushing on the
  other end.
The ball bearing race housings are instrumented with thermistors to measure the
On bi-parting tracks, provide two-wheel nylon or ball bearing end pulleys with
  zinc-coated steel housing at each end.
Precision ball bearing, full extension drawer suspensions used on all drawers.
Image for ball bearing
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