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service module

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

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for service module

service module

noun
  1. a section of an Apollo spacecraft housing the rocket engine, radar, fuel cells, etc, and jettisoned on re-entry into the earth's atmosphereSee also lunar module, command module
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012