/ Dictionary / Index W witch moth: Meaning and Definition of Find definitions for: witch' moth" Pronunciation: [key] any of several large noctuid moths of the genus Erebus, esp. the blackish E. odoraof Central and North America. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. witching hour witch of Agnesi Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language