often attributive
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
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
: 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
Nia Bowers, USA Today, 17 June 2025
Some drugs that inhibit the mTOR pathway have shown some promise, and noncancerous masses can be treated with things like surgery and laser treatments.
—Eric Berger, ArsTechnica, 12 June 2025
Brian Hiatt, Rolling Stone, 30 June 2024
But even in spite of all of the swirl, the team is still able to laser focus and deliver day in and day out.
—Josef Adalian, Vulture, 14 Mar. 2024
See All Example Sentences for laser
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Noun
The process is driven entirely by exposure to cold laser light.
—Nia Bowers, USA Today, 17 June 2025
Some drugs that inhibit the mTOR pathway have shown some promise, and noncancerous masses can be treated with things like surgery and laser treatments.
—Eric Berger, ArsTechnica, 12 June 2025
Verb
Homelander found some of her breast milk in a freezer and lasers it, starts drinking it, gets caught.
—Brian Hiatt, Rolling Stone, 30 June 2024
But even in spite of all of the swirl, the team is still able to laser focus and deliver day in and day out.
—Josef Adalian, Vulture, 14 Mar. 2024
See All Example Sentences for laser
Cite this Entry
“Laser.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/laser. Accessed 2 Jul. 2025.
Copy CitationKids Definition
laser
1 of 2 noun
la·ser
ˈlā-zər 
: a device that uses the natural vibrations of atoms or molecules to generate a narrow beam of light having a small frequency range
laser
2 of 2 verb
: to subject to the action of a laser
Etymology
Noun
light amplification by stimulated emission of radiation
Medical Definition
laser
1 of 2 noun
la·ser
ˈlā-zər
: 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
laser
2 of 2 transitive verb
: 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
Jenny ManzerLove words? Need even more definitions?
Merriam-Webster unabridged
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