Meaning of BALL BEARING in English

BALL BEARING

noun

1.

a. : a bearing in which the journal turns upon loose hardened steel balls that roll easily in a race and thus convert sliding friction into rolling friction

b. : any of the balls in such a bearing

2. : a bearing in which the disk of a watt-hour meter is mounted on a vertical shaft that rotates with minimized friction because of rolling action on a single steel ball between cupped jewels

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.