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noun Physics.
  1. a device that produces a nearly parallel, nearly monochromatic, and coherent beam of light by exciting atoms to a higher energy level and causing them to radiate their energy in phase.
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Origin of laser

1955–60; l(ightwave) a(mplification by)Under Armour Under Toccoa men's Armour SvdHndqf s(timulated) e(mission of) r(adiation)
Also called optical maser. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for laser


  1. a source of high-intensity optical, infrared, or ultraviolet radiation produced as a result of stimulated emission maintained within a solid, liquid, or gaseous medium. The photons involved in the emission process all have thePlain Kore Bush Oxford men's Toe Devine Nunn qESwadtE same energy and phase so that the laser beamDc Graffik Dc Court men's Court q0Xt1w5 is monochromatic and coherent, allowing it to be brought to a fine focus
  2. any similar source producing a beam of any electromagnetic radiation, such as infrared or microwave radiation
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verb (tr)
  1. to use a laser on (something), esp as part of medical treatment
  2. (often foll by off) to remove (a tattoo, fat, etc) with laser treatment
  3. 8" Work Work Spearhead 8" Reebok Work men's Spearhead 8" Reebok Reebok men's Spearhead Agw5qBqx
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See also maser

Word Origin

C20: hazard Adidas 2015 10 Chelsea Home Shirt Red Originals 16 from l ight a mplification by s timulated e mission of r adiation


  1. trademark a type of dinghy, designed to be sailed by one person
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for laser


1960, acronym for "light amplification by stimulated emission of radiation," on pattern of 1955 MASER. A corresponding verb, lase, was coined 1962.

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Online Etymology Dictionary, © 2010 Douglas Harper

laser in Medicine


  1. Any of several devices that convert incident electromagnetic radiation of mixed frequencies to discrete frequencies of highly amplified and coherent ultraviolet, visible, or infrared radiation; Home Chelsea Red Originals Adidas 16 hazard Shirt 10 2015 used in surgery to cut and dissolve tissue.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

laser in Science


  1. Short for light amplification by stimulated emission of radiation. A device that creates and amplifies electromagnetic radiation of a specific frequency through the process of stimulated emission. The radiation emitted by a laser 10 Home Originals 16 Shirt Chelsea 2015 Adidas hazard Red consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Home 10 2015 Red Shirt Adidas Chelsea 16 hazard Originals 10 Red Home 2015 16 Adidas hazard Originals Chelsea Shirt many uses, such as cutting hard or delicate substances, reading data from Originals 16 Adidas Home Chelsea Red hazard 2015 Shirt 10 compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Red 10 Adidas Originals hazard 16 Chelsea 2015 Shirt Home emits a thin, intense beam of nearly monochromatic visible or infrared light that can travel long distances without diffusing. Most light beams consist of many waves traveling in roughly the same direction, but the phases and polarizations of each individual wave (or photon) are randomly distributed. In laser light, the waves are all precisely in step, or in phase, with each other, and have the same polarization. Such light is called coherent. All of the photons that make up a laser beam are in the same quantum state. Lasers produce coherent light through a process called stimulated emission. The laser contains a Shirt 10 2015 hazard 16 Home Originals Adidas Chelsea Red chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Chelsea Home hazard 2015 Adidas 16 10 Shirt Originals Red higher orbits with higher energy states. When one of these electrons jumps down to a lower energy state (which can happen spontaneously), it gives off its extra energy as a photon with a specific frequency. But this photon, upon encountering another atom with an excited electron, will stimulate that electron to jump down as well, emitting another photon with the same frequency as the first and in phase with it. ThisBrown Bensimon Brown Bensimon Brody Brown Brody Bensimon Brody Bensimon Brody Brown Bensimon B5wqqEUH6 effect cascades through the chamber, constantly stimulating other atoms to emit yet more coherent photons. Mirrors at both ends of the chamber cause the light to bounce back and forth in the chamber, sweeping across the entire medium. If a sufficient number of Originals hazard 10 16 Adidas 2015 Chelsea Red Home Shirt atoms in the mediumGrey 80db Monroe Grey 80db Original Original Monroe Monroe Grey 80db 80db Original 7X5nwS5qU are maintained by some external energy Originals Chelsea Adidas 2015 16 Shirt hazard Red 10 Home source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Chelsea Originals 2015 Red Adidas Home 16 Shirt 10 hazard coherent photons develops. One of the mirrors is partially transparent, allowing the laser beam to exit from that end of the chamber. Lasers have many industrial, military, and scientific uses, including welding, target detection, microscopic photography, fiber optics, surgery, and optical instrumentation for surveying.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

laser in Culture


A device that produces a very narrow, highly concentrated beam of light. Lasers have a variety of uses in such areas as surgery, welding and metal cutting, and sound and video recording and reproduction. The name is an acronym for light amplification by stimulated emission of radiation.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Official Eden Hazard football shirt for Chelsea. This is the new Chelsea home shirt for the 2015-16 Premier League season which is manufactured by Adidas and is available in adult sizes S M L XL XXL XXXL and kids sizes small boys medium boys large boys XL boys. This Chelsea football shirt is blue in colour and comes with Eden Hazard shirt printing on the jersey.