English version

ball bearing in Mechanical topic

From Longman Dictionary of Contemporary Englishball bearingˌball ˈbearing noun [countable]  1 Tan arrangement of small metal balls that move in a ring, to make a part inside a machine turn more easily2 Tone of these metal balls
Examples from the Corpus
ball bearingIn the first system the rotation of the mouse's wheels or ball bearing are transferred to rollers.