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.

Origin of ball bearing

First recorded in 1880–85
Related formsball-bear·ing, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ball bearing

Historical Examples of ball bearing

  • Time sweeps by us on electrically-driven, ball-bearing pinions.

  • 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

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

  • A unique advantage of the Howard-Smith machine is that it is ball-bearing throughout.

    Leather

    K. J. Adcock


British Dictionary definitions for ball bearing

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
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

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.