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
First recorded in 1880–85
OTHER WORDS FROM ball bearing
ball-bear·ing, adjectiveWords nearby ball bearing
balky,
ball,
ball ammunition,
ball and chain,
ball and ring,
ball bearing,
ball boy,
ball clay,
ball club,
ball cock,
ball control
Example sentences from the Web for ball bearing
British Dictionary definitions for ball bearing
ball bearing
noun
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
Scientific definitions for ball bearing
ball 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.