[ verb dih-fyooz; adjective dih-fyoos ]
/ verb dɪˈfyuz; adjective dɪˈfyus /

verb (used with object), dif·fused, dif·fusing.

verb (used without object), dif·fused, dif·fusing.

to spread.
Physics. to intermingle by diffusion.



Origin of diffuse

1350–1400; Middle English (< Anglo-French) < Latin diffūsus spread, poured forth. See dif-, fuse2

Related forms

Can be confused

defuse diffuse
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for diffusely

British Dictionary definitions for diffusely


verb (dɪˈfjuːz)

adjective (dɪˈfjuːs)

Derived Forms

diffusely (dɪˈfjuːslɪ), adverbdiffuseness, noundiffusible (dɪˈfjuːzəbəl), adjectivediffusibility or diffusibleness, noun

Word Origin for diffuse

C15: from Latin diffūsus spread abroad, from diffundere to pour forth, from dis- away + fundere to pour


Avoid confusion with defuse
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for diffusely


[ dĭ-fyōōs ]


Not limited to one tissue or location; widespread.


To spread or to be spread widely, as through a tissue.

Related forms

dif•fusi•ble (-fyōōzə-bəl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.