- 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
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ball bearing
Time sweeps by us on electrically-driven, ball-bearing pinions.Nan Sherwood at Pine Camp
Annie Roe Carr
But it seems to me, Danny, if we had a pair of ball-bearing skates we'd be just as good as they are.
And, what's more, by the time vacation comes I'll have the finest pair of ball-bearing skates in town!
Turning on his ball-bearing wheel, he rolled off down the street, a perfect picture of outraged metallic dignity.Robots of the World! Arise!
A unique advantage of the Howard-Smith machine is that it is ball-bearing throughout.Leather
K. J. Adcock
- 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
- 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.
- 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.