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

  • noun A metal cylinder to which pressure is applied by a braking mechanism in order to arrest rotation of the wheel or shaft to which the cylinder is attached.

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

  • noun A hollow metal cylinder, attached to a wheel of a vehicle, to which pressure is applied when braking.

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

  • noun a hollow cast-iron cylinder attached to the wheel that forms part of the brakes


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