LEM LEM, LEM L.E.M. . [acronym from Lunar Excursion Module.] (Astronautics) A {lunar excursion module}, a spacecraft designed to transport people from a command module in orbit around the moon to the surface of the moon and back again.

Syn: lunar excursion module, lunar module. [WordNet 1.5]

The Collaborative International Dictionary of English. 2000.

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