/ Dictionary / Index W waning moon: Meaning and Definition of Find definitions for: wan'ing moon' Pronunciation: [key] the moon at any time after full moon and before new moon (so called because its illuminated area is decreasing). Also calledCf.See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. wanigan wanion Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language