LEM definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
noun pl. LEMs
a lunar excursion module, the manned spacecraft that landed on the moon
LEM definition by American Heritage Dictionary
A lunar excursion module.
Origin: l(unar) e(xcursion) m(odule).