combustion chamber

noun Machinery.
a chamber, as in an engine or boiler, where combustion occurs.

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
combustion chamber
 
n
an enclosed space in which combustion takes place, such as the space above the piston in the cylinder head of an internal-combustion engine or the chambers in a gas turbine or rocket engine in which fuel and oxidant burn

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
combustion chamber  
An enclosure in which combustion, especially of a fuel or propellant, is initiated and controlled. See also internal-combustion engine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The job of the choke is to reduce the airflow to the combustion chamber and
  increase fuel intake.
The combustion chamber is separated into a lower pile section for primary
  combustion and an upper secondary-combustion section.
During this evaluation employees wore disposable dust masks while working in
  the combustion chamber.
Following the secondary combustion chamber, the gases enter the evaporative
  cooler, where the combustion gases are cooled.
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