Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

diffuser

play
noun dif·fus·er \di-ˈfyü-zər\

Definition of diffuser

  1. 1 :  one that diffuses: as a :  a device (as a reflector) for distributing the light of a lamp evenly b :  a screen (as of cloth or frosted glass) for softening lighting (as in photography) c :  a device (as slats at different angles) for deflecting air from an outlet in various directions

  2. 2 :  a device for reducing the velocity and increasing the static pressure of a fluid passing through a system



Circa 1679

First Known Use of diffuser

circa 1679


Seen and Heard

What made you want to look up diffuser? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 9, 2016

marked by high spirits and laughter

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

pince-nez kittly-benders duvet spindrift
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ