/ Dictionary / Index D diffusive: Meaning and Definition of Find definitions for: dif•fu•sive Pronunciation: (di-fy'siv), [key] — adj. tending to diffuse; characterized by diffusion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diffusive (Thesaurus) diffusionism diffusivity Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language