refractive index

noun

Definition of refractive index

  1. :  the ratio of the speed of radiation (such as light) in one medium (such as air, glass, or a vacuum) to that in another medium

1839

First Known Use of refractive index

1839


Medical Dictionary

refractive index

noun

Medical Definition of refractive index


Learn More about refractive index


Seen and Heard

What made you want to look up refractive index? 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

a lively discussion

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • istock-refers-to-this-as-a-tumble-of-strawberries-which-sounded-pretty-nice-to-us
  • Which is a synonym of garner?
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!