Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary
1

laser

play
noun, often attributive la·ser \ˈlā-zər\

Simple Definition of laser

  • : a device that produces a narrow and powerful beam of light that has many special uses in medicine, industry, etc.

Source: Merriam-Webster's Learner's Dictionary

Full Definition of laser

  1. 1 :  a device that utilizes the natural oscillations of atoms or molecules between energy levels for generating a beam of coherent electromagnetic radiation usually in the ultraviolet, visible, or infrared regions of the spectrum

  2. 2 :  something resembling a laser beam in accuracy, speed, or intensity <threw a laser into the end zone> <a laser stare>

Examples of laser in a sentence

  1. doctors using a laser to perform delicate eye surgery



Origin of laser

light amplification by stimulated emission of radiation


First Known Use: 1957


2

laser

verb la·ser

Definition of laser

  1. transitive verb
  2. :  to subject to the action of a laser

  3. :  treat with a laser



1978

First Known Use of laser

1978



LASER Defined for Kids

laser

play
noun la·ser \ˈlā-zər\

Definition of laser for Students

  1. :  a device that produces a very powerful beam of light




Learn More about laser


Seen and Heard

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

WORD OF THE DAY

a division or portion of a pool or whole

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1926873504

Which of the following best describes an easily irritated person?

flashy superficial gregarious tetchy
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ