cylinder head

noun
(in a reciprocating engine or pump) a detachable plate or cover on the end opposite to that from which the piston rod or connecting rod projects.

Origin:
1880–85

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World English Dictionary
cylinder head
 
n
Sometimes shortened to: head the detachable metal casting that fits onto the top of a cylinder block. In an engine it contains part of the combustion chamber and in an overhead-valve four-stroke engine it houses the valves and their operating mechanisms

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The bike earned its nickname because of the cooling fins on its cylinder head.
Cylinder head chambers modified, reshaped and polished.
Investigation revealed that the cylinder head had been improperly installed
  using mounting bolts that were too long.
In all situations the cylinder head and regulator are to be protected.
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