noun, often attributive
la·​ser | \ ˈlā-zər How to pronounce laser (audio) \

Definition of laser

 (Entry 1 of 2)

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 also : the beam of coherent radiation itself The cesium fluoresced. This told them they had the necessary population of excited atoms to produce a laser. — Nick Taylor
2 : something resembling a laser beam in accuracy, speed, or intensity threw a laser into the end zone a laser stare


lasered; lasering; lasers

Definition of laser (Entry 2 of 2)

transitive verb

: to subject to the action of a laser : treat with a laser

Examples of laser in a Sentence

Noun doctors using a laser to perform delicate eye surgery
Recent Examples on the Web: Noun So Verma enlisted the help of a mannequin, a smoke machine, and a laser. Erin Blakemore, National Geographic, "How to make masks that everyone will want to wear," 10 July 2020 Reporters and bystanders said the protests were still fairly quiet, and the person appeared to have pointed a laser, but there was no immediately clear reason the person was arrested. oregonlive, "Federal police tackle, arrest person at Terry Schrunk Plaza during protests," 9 July 2020 Upon arrival, the 21-year-old saw a laser pointed at him from one of the home’s windows. cleveland, "Two teens arrested for aggravated robbery in gun theft: Cleveland Heights police blotter," 27 June 2020 Above all, the couple shared a lifelong bond and a laser focus on their family, becoming grandparents to seven. Washington Post, "She was a nurse and flight attendant. He was a soldier. For 69 years, their love spanned the globe.," 26 June 2020 Both boys are friendly, self-assured and laser-focused on their mission. Michelle Matthews |, al, "Teenage entrepreneurs want to help you ‘Get Through It’," 13 July 2020 The night before, a BORTAC agent tackled and arrested a demonstrator suspected of pointing a laser at him and others from a park across the street from the courthouse. Ben Fox And Gillian Flaccus, The Christian Science Monitor, "Monument watch: Trump order marks new role for Homeland Security," 10 July 2020 Demonstrators are also accused of shining laser beams in the eyes of federal officers, assaulting officers with a shield and destroying a security camera. CBS News, "7 Portland protesters face federal charges for defacing courthouse, assaulting officers," 8 July 2020 Doing so will allow the composition of rocks to be measured without first vaporizing them with laser beams (the more destructive technique employed by Curiosity). Jonathan O'callaghan, Scientific American, "Summer on Mars: NASA's Perseverance Rover Is One of Three Missions Ready to Launch," 7 July 2020 Recent Examples on the Web: Verb This condition is called twin-to-twin transfusion syndrome and is treatable either by early delivery or by lasering blood vessels in the placenta. Anna Nowogrodzki, New York Times, "When and Why to Get Ultrasounds During Pregnancy," 17 Apr. 2020 Others were initially caught off guard by a black line lasered onto the basketball to help with shooting mechanics. Chris Fedor, cleveland, "How John Beilein’s coaching tenure with Cleveland Cavaliers crumbled so quickly: Chris Fedor," 19 Feb. 2020 Stimpson lasered in on a large warehouse at the Brookley Aeroplex, about 3 miles south of downtown. al, "Can Mobile’s Mardi Gras good times roll year round?," 23 Feb. 2020 All together, to laser both the front and back of my legs took about 10 minutes. Kaitlyn Frey,, "We Tried It: SEV, the Kardashian-Jenner Family's Go-To Laser Hair Removal Spa," 19 Dec. 2019 Bad Bunny’s stylist tells Billboard the coat was custom-made in Berlin and has 13,000 stones lasered into the fabric. Leila Cobo, Billboard, "J Balvin Debuts Jordan Line During Super Bowl Halftime, While Bad Bunny Is Covered in Crystals: Exclusive," 2 Feb. 2020 The L’il Ball o’Hate summoned his best Joe Sakic imitation on the equalizer, lasering an off-the-back-foot wrister past Carter Hart with 7:38 to go in regulation., "Well, call it the Bruin in you.," 11 Nov. 2019 Per design, Krug was supposed to toss the puck to Bergeron, who in turn would bump it back to Krug, who in turn would laser a pass to Marchand breaking wide on the wing., "Krug's overtime winner," 23 Nov. 2019 Helped by a Sean Kuraly muff in Boston’s defensive end, Timashov raced right-left across the slot and lasered a sharp wrister to the top righthand corner., "Rielly's overtime winner," 19 Oct. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'laser.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of laser


1957, in the meaning defined at sense 1


1978, in the meaning defined above

History and Etymology for laser


light amplification by stimulated emission of radiation

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Time Traveler for laser

Time Traveler

The first known use of laser was in 1957

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Statistics for laser

Last Updated

30 Jul 2020

Cite this Entry

“Laser.” Dictionary, Merriam-Webster, Accessed 3 Aug. 2020.

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More Definitions for laser


How to pronounce laser (audio)

English Language Learners Definition of laser

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


la·​ser | \ ˈlā-zər How to pronounce laser (audio) \

Kids Definition of laser

: a device that produces a very powerful beam of light


la·​ser | \ ˈlā-zər \

Medical Definition of laser

 (Entry 1 of 2)

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

Medical Definition of laser (Entry 2 of 2)

: to subject to the action of a laser : treat with a laser cutting a corneal flap to remove tissue and then lasering the area under it— Jenny Manzer

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More from Merriam-Webster on laser

Thesaurus: All synonyms and antonyms for laser

Rhyming Dictionary: Words that rhyme with laser

Spanish Central: Translation of laser

Nglish: Translation of laser for Spanish Speakers

Britannica English: Translation of laser for Arabic Speakers Encyclopedia article about laser

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