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laser Syllabification: la·ser
Pronunciation: /ˈlāzər/

Definition of laser in English:


A device that generates an intense beam of coherent monochromatic light (or other electromagnetic radiation) by stimulated emission of photons from excited atoms or molecules. Lasers are used in drilling and cutting, alignment and guidance, and in surgery; the optical properties are exploited in holography, reading bar codes, and in recording and playing compact discs.
Example sentences
  • This lattice can trap the neutral atoms in potential wells because the electric fields of the lasers induce a dipole moment in the atom.
  • It has led to computers, lasers and nuclear reactors, and it tells us why the Sun shines and why the ground beneath our feet is solid.
  • The structure has potential for the development of active optical devices such as lasers and passive components.


[with object] Back to top  
Treat or remove (something) using a laser, especially as part of surgery: I’ve got to get my eyes lasered again he has had tattoos lasered off his chest
More example sentences
  • The surgery involves lifting a small flap of corneal tissue and lasering onto the deeper cornea beneath.
  • While he was lasering, he remarked the patient had started bleeding.
  • Every few years, my test results would require freezing, or burning, or lasering mutating pre-cancerous cells away.


1960s: acronym from light amplification by stimulated emission of radiation, on the pattern of maser.

  • radar from [M20]:

    This system for detecting objects by sending out radio waves which are reflected back was developed in the 1930s. The name comes from the opening letters of radio detection and ranging, and was coined in 1941. Police started using radar traps to detect speeding motorists in the early 1960s. In the Second World War the myth that pilots ate lots of carrots to help them see in the dark was spread to explain how they could detect enemy planes, as radar was still a secret. Other words have been coined on the pattern of radar, such as lidar (mid 20th century), which works like radar, but uses light from lasers (mid 20th century)—laser itself being an acronym from ‘light amplification by the stimulated emission of radiation’.

Words that rhyme with laser

appraiser, blazer, eraser, Fraser, gazer, glazer, grazer, mazer, praiser, razor, salmanazar, taser, Weser
Definition of laser in:
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