Wiktionary
n. 1 (&lit lang=en cylinder head) 2 (context automotive English) A part of an internal combustion engine, usually made as a removable piece, that closes one end of the engine's cylinders.
WordNet
n. a detachable plate that covers the closed end of a cylinder chamber in a reciprocating engine or pump
Wikipedia
In an internal combustion engine, the cylinder head (often informally abbreviated to just head) sits above the cylinders on top of the cylinder block. It closes in the top of the cylinder, forming the combustion chamber. This joint is sealed by a head gasket. In most engines, the head also provides space for the passages that feed air and fuel to the cylinder, and that allow the exhaust to escape. The head can also be a place to mount the valves, spark plugs, and fuel injectors.
Usage examples of "cylinder head".
It's only a matter of moments before the pressure builds up enough to blow the cylinder head off with a tremendous crash.
They had removed the cylinder head and washed out the cylinders with fresh water and had hosed out the crankcase, Keith rejecting a proposal that they should take off the sump again as being quite unnecessary.
That, Gilliland had explained, was because the wind put more pressure on the long stick than on the cylinder head, and so the tubes had to be aimed down-wind for an upwind target.
Looping a heaving line round the outboard's cylinder head and hauling alternately on the heaving line and painter, I had both dinghy and outboard up and over in two minutes.
Except for the protruding in-line cylinder head, the fuselage followed a streamlined shape that tapered to straight skies at the open cockpit The great wooden propeller beat the air like an old windmill, pulling the ancient craft over the landscape at a tortoise-like air speed.
They detached a part of the induction manifold and passed it down to the ground, and started to slack off the nuts of the next cylinder head.
When it was back on the trailer and lashed in place, I tried to pull it with the Maule, maximum thrust, taking cylinder head temperatures to dangerous extremes.
But more oil had leaked past than even the mechanic had imagined and as the starter-motor engaged an angry geyser of black oil shot out of the cylinder head, catching him square in the face.
The cylinder head had been hastily slid back on to its bolts without being seated and it rested drunkenly upon the engine.
The gas was ignited by the spark plugs and the explosion hit the cylinder head and the head was thrust down and that turned the crankshaft and the valves opened and closed and the cylinder heads kept going up and down and the crankshaft turned some more.