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ball bearing:see bearingbearing,
machine part designed to reduce friction between moving parts or to support moving loads. There are two main kinds of bearings: the antifriction type, such as the roller bearing and the ball bearing, operating on the principle of rolling friction; and the plain, or
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ball bearing[‚bȯl ′ber·iŋ]
An antifriction bearing permitting free motion between moving and fixed parts by means of balls confined between outer and inner rings.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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 Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005