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head

1. head Noun. (automotive) The cylinder head, a platform above the cylinders in an internal combustion engine, containing the valves and spark plugs.
cylinder head
1. Noun. (automotive) A part of an internal combustion engine, usually made as a removable piece, that closes one end of the engine's cylinders.
cylinder
1. Noun. (geometry) A surface created by projecting a closed two-dimensional curve along an axis intersecting the plane of the curve.
2. Noun. (geometry) A solid figure bounded by a cylinder and two parallel planes intersecting the cylinder.
3. Noun. Any object in the form of a circular cylinder.
4. Noun. A cylindrical cavity or chamber in a mechanism, such as the counterpart to a piston found in a piston-driven engine.
5. Noun. A container in the form of a cylinder with rounded ends for storing pressurized gas.
6. Noun. An early form of phonograph recording, made on a wax cylinder.
7. Noun. The part of a revolver that contains chambers for the cartridges.
8. Noun. (computing) The corresponding tracks on a vertical arrangement of disks in a disk drive considered as a unit of data capacity.
internal combustion engine
1. Noun. A piston or a rotary heat engine directly powered by the products of intermittent combustion of a fuel.
2. Noun. A heat engine in which intermittent or the continuous burning of a fuel takes place inside a combustion chamber; the resulting pressurized gas acts directly on the engine to do useful work, such as a piston engine, gas turbine, jet engine or rocket.[http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.britannica.com%2Feb%2Farticle-9106036%2Finternal-combustion-engine&ei=ZdJqSMCnDo_o0gXitpynDA&usg=AFQjCNE6h_t0H7XJLKnUjudcNQjmgMeUdg&sig2=srdZ
valve
1. Noun. A device that controls the flow of a gas or fluid through a pipe.
2. Noun. A device that admits fuel and air into the cylinder of an internal combustion engine, or one that allows combustion gases to exit.
3. Noun. (anatomy) One or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or retard the flow in the opposite direction; as, the ileocolic, mitral, and semilunar valves.
4. Noun. (British) A vacuum tube.
5. Noun. (botany) One of the pieces into which certain fruits naturally separate when they dehisce.
6. Noun. (botany) A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry.
7. Noun. (biology) One of the pieces or divisions of bivalve or multivalve shells.
8. Noun. (biology) One of the two similar portions of the shell of a diatom.
9. Verb. (transitive) To control (flow) by means of a valve.
spark plug
1. Noun. The part of an internal combustion engine which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke.