/ Dictionary / Index D deutero-: Meaning and Definition of Find definitions for: deutero- Pronunciation: [key] a combining form meaning “second,” used in the formation of compound words: deuterocanonical. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. deuterium oxide deuterocanonical books Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language