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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.
Origin of ball bearing
Related forms
ball-bearing, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for ball-bearing
Historical Examples
  • But it seems to me, Danny, if we had a pair of ball-bearing skates we'd be just as good as they are.

    The Rosie World Parker Fillmore
  • And, what's more, by the time vacation comes I'll have the finest pair of ball-bearing skates in town!

    The Rosie World Parker Fillmore
  • Time sweeps by us on electrically-driven, ball-bearing pinions.

    Nan Sherwood at Pine Camp Annie Roe Carr
  • A unique advantage of the Howard-Smith machine is that it is ball-bearing throughout.

    Leather K. J. Adcock
  • Our "1900" ball-bearing Washer is constructed on principles entirely different from any other washing machine on the market.

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

  • To steady the top of the shaft a light boxing is used, preferably a ball-bearing bicycle race to reduce friction.

    Farm Mechanics Herbert A. Shearer
  • It should be a good machine having hard rubber rollers, ball-bearing action, and strong springs at the side.

  • Turning on his ball-bearing wheel, he rolled off down the street, a perfect picture of outraged metallic dignity.

  • The rollers should be four inches or more in diameter and should preferably be of the ball-bearing type.

British Dictionary definitions for ball-bearing

ball bearing

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
a metal ball, esp one used in such a bearing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ball-bearing in Science
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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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