roller bearing

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A bearing using rollers to reduce friction between machine parts.

from The Century Dictionary.

• noun A journal-socket which has antifriction rollers on its interior perimeter; a ring-bush.

from the GNU version of the Collaborative International Dictionary of English.

• (Mach.) A bearing containing friction rollers.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A bearing, in which the load is carried by round (e.g. cylindrical or spherical) elements.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun bearings containing small metal balls