/ Dictionary / Index D diffusor: Meaning and Definition of Find definitions for: dif•fu•sor Pronunciation: (di-fy'zur), [key] — n. diffuser. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diffusor (Thesaurus) diffusivity difluence Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language