[verb dih-fyooz; adjective dih-fyoos]
- to pour out and spread, as a fluid.
- to spread or scatter widely or thinly; disseminate.
- Physics. to spread by diffusion.
- to spread.
- Physics. to intermingle by diffusion.
- characterized by great length or discursiveness in speech or writing; wordy.
- widely spread or scattered; dispersed.
- Botany. widely or loosely spreading.
- Optics. (of reflected light) scattered, as from a rough surface (opposed to specular).
Origin of diffuse
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- to spread or cause to spread in all directions
- to undergo or cause to undergo diffusion
- to scatter or cause to scatter; disseminate; disperse
- spread out over a wide area
- lacking conciseness
- (esp of some creeping stems) spreading loosely over a large area
- characterized by or exhibiting diffusiondiffuse light; diffuse reflection
- botany (of plant growth) occurring throughout a tissue
C15: from Latin diffūsus spread abroad, from diffundere to pour forth, from dis- away + fundere to pour
Avoid confusion with defuse
Word Origin and History for undiffused
1520s (transitive), 1650s (intransitive), from Latin diffusus, past participle of diffundere "to pour out or away" (see diffusion). Related: Diffused; diffusing.
early 15c., from Latin diffusus (see diffuse (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
- Not limited to one tissue or location; widespread.
- To spread or to be spread widely, as through a tissue.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.