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roller bearing

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roller bearing

–noun Machinery.
a bearing consisting of cylindrical or tapered rollers running between races in two concentric rings, one of which is mounted on a rotating or oscillating part, as a shaft.

Origin:
1855–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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roller bearing  
n.  A bearing using rollers to reduce friction between machine parts.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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