/ Dictionary / Index D devil dog: Meaning and Definition of Find definitions for: dev'il dog" Pronunciation: [key] — Informal. Informal. a United States Marine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. devil devilfish Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language