service module

noun
(often initial capital letters) U.S. Aerospace. the section of an Apollo spacecraft containing the principal propulsion system, electrical system, water, and other supplies.

Origin:
1960–65

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World English Dictionary
service module
 
n
lunar module See also command module a section of an Apollo spacecraft housing the rocket engine, radar, fuel cells, etc, and jettisoned on re-entry into the earth's atmosphere

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Example sentences
The astronauts and cosmonauts plan to deliver supplies to the service module, install a toilet, and complete some electrical work.
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