Breadcrumb Home > Dictionary > Index I Cite ichneumon fly: Meaning and Definition of Find definitions for: ichneu'mon fly" Pronunciation: [key] any of numerous wasplike insects of the family Ichneumonidae, the larvae of which are parasitic on caterpillars and immature stages of other insects. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ichneumon ichno- TrendingHere are the facts and trivia that people are buzzing about. January 2021 Current Events: US News Noble Titles and Ranks in a Monarchy Chinese New Year History, Meaning, and Celebrations The Manchu The 5 Best Air Purifiers of 2020 Inaugural Trivia Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language