from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of several devices that emit highly amplified and coherent radiation of one or more discrete frequencies. One of the most common lasers makes use of atoms in a metastable energy state that, as they decay to a lower energy level, stimulate others to decay, resulting in a cascade of emitted radiation.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A device that produces a monochromatic, coherent beam of light.
  • v. To cut with a laser
  • v. To throw with laser-like precision
  • n. A gum resin obtained from certain umbelliferous plants.
  • n. Such a plant.

from the GNU version of the Collaborative International Dictionary of English

  • n. A device which produces an intense, usually narrow, monochromatic beam of coherent light; called also optical maser. It has various forms, and is used in various applications in science and technology. The beam is produced by boosting the majority of the electrons in specific radiation-absorbing atoms in a medium into a higher energy level, from which they are stimulated by their own emitted radiation to drop back synchronously to their lower energy level, and emit light which is in phase (coherent).

from The Century Dictionary and Cyclopedia

  • n. A gum-resin obtained from the north of Africa, and greatly esteemed by the ancients as an antispasmodic, deobstruent, and diuretic. It is supposed to have been produced by Thapsia Garganica or one of the varieties of that plant. Also called asadulcis.
  • n. An obsolete form of leisure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light


from The American Heritage® Dictionary of the English Language, 4th Edition

l(ight) a(mplification by) s(timulated) e(mission of) r(adiation).

from Wiktionary, Creative Commons Attribution/Share-Alike License

Acronym of Light Amplification by the Stimulated Emission of Radiation. Originally called an optical maser.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin



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  • I don't understand this use of laser:

    "The property has been lasered with recycle dam and pump, plus central laneway, elec fencing and troughs in all the paddocks, Cattle yards with crush plus ramp, 4 Bay Machinery shed with power and cement floor, disused dairy, tackle room plus Hay Shed and other Machinery shed."

    - real estate ad.

    May 14, 2009

  • Light Amplification by Stimulated Emission of Radiation

    February 28, 2007