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

phosphor

play
noun phos·phor \ˈfäs-fər, -ˌfȯr\

Definition of phosphor

  1. 1 :  a phosphorescent substance

  2. 2 :  a luminescent substance that emits light when excited by radiation (as electrons) and is used especially in fluorescent lamps and cathode-ray tubes



Variants of phosphor

also phos·phore play \-ˌfȯr, -fər\

Origin of phosphor

Latin phosphorus, from Greek phōsphoros, literally, light bringer, from phōsphoros light-bearing, from phōs light + pherein to carry, bring — more at fancy, bear


First Known Use: 1705


Medical Dictionary

phosphor

play
noun phos·phor \ˈfäs-fər, -ˌfȯ(ə)r\

Medical Definition of phosphor

  1. :  a phosphorescent substance; specifically :  a substance that emits light when excited by radiation



Variants of phosphor

also phos·phore \-ˌfō(ə)r, -ˌfȯ(ə)r, -fər\play

phosphor-

combining form phos·phor

Medical Definition of phosphor-

  1. :  phosphoric acid <phosphorolysis>



Variants of phosphor-

or phosphoro-

Learn More about phosphor


Seen and Heard

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

WORD OF THE DAY

February 8, 2016

to clear from accusation or blame

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?

kittly-benders spindrift pince-nez duvet
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