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

irradiance

play
noun ir·ra·di·ance \i-ˈrā-dē-ən(t)s\

Definition of irradiance

  1. 1 :  radiance 1

  2. 2 :  the density of radiation incident on a given surface usually expressed in watts per square centimeter or square meter



1599

First Known Use of irradiance

1599


Medical Dictionary

irradiance

play
noun ir·ra·di·ance \ir-ˈād-ē-ən(t)s\

Medical Definition of irradiance

  1. :  the density of radiation incident on a given surface usually expressed in watts per square centimeter or square meter




Learn More about irradiance

  1. Medical Dictionary: Definition of "irradiance"


Seen and Heard

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

WORD OF THE DAY

February 14, 2016

to hug and kiss another person

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

100 pounds 196.5 pounds 2.2 pounds 16.96 pounds
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