2 definitions found From WordNet (r) 2.0 [wn]: LEM noun: a spacecraft that carries astronauts from the command module to the surface of the moon and back [syn: {lunar excursion module}, {lunar module}] From The Collaborative International Dictionary of English v.0.44 [gcide]: LEM \LEM\, LEM \L.E.M.\n. [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]

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