/ Dictionary / Index N natural levee: Meaning and Definition of Find definitions for: na'tural lev'ee Pronunciation: [key] a deposit of sand or mud built up along, and sloping away from, either side of the flood plain of a river or stream. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. natural law natural logarithm Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language