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

  • noun The closed, often detachable, end of a cylinder in an internal-combustion engine.

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

  • noun automotive A part of an internal combustion engine, usually made as a removable piece, that closes one end of the engine's cylinders.

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

  • noun a detachable plate that covers the closed end of a cylinder chamber in a reciprocating engine or pump


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