/ Dictionary / Index L lunar excursion module: Meaning and Definition of Find definitions for: lu'nar excur'sion mod"ule Pronunciation: [key] — U.S. Aerospace. (often cap.)U.S. Aerospace. SeeAbbr.: LEM Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lunar eclipse lunarian Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language