index of refraction

noun phrase

Definition of index of refraction

First Known Use of index of refraction

1829

in the meaning defined above

See Words from the same year
NEW! Time Traveler

Medical Dictionary

index of refraction

noun

medical Definition of index of refraction

: the ratio of the speed of radiation (as light) in one medium (as a vacuum) to that in another medium called also refractive index

Learn More about index of refraction


Seen and Heard

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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

soothing, mild, or foolish

Get Word of the Day daily email!

Test Your Vocabulary

Name More Food!

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!