ball bearing noun
plural ball bearings
plural ball bearings
Learner's definition of BALL BEARING
[count]
1
: a part of a machine in which another part (such as a metal pole) turns easily ◊ A ball bearing is made up of several small metal balls that fit between two metal rings.滚珠轴承,球轴承(由装在两个钢圈之间的多个小钢球组成)
2
: one of the balls in a ball bearing(滚珠轴承中的一个)钢球,滚珠