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
Shamira Ibrahim, Vulture, 6 Oct. 2025
His one-off, which is steel rather than titanium and high-tech bulk metallic glass (BMG), has laser-engravings of intricate watch components on the case and dial that come together to create a distinctive camouflage pattern.
—Rachel Cormack, Robb Report, 4 Oct. 2025
Brad Lendon, CNN Money, 3 Sep. 2025
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
See All Example Sentences for laser
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Noun
Absent Karen’s presence to hold the fire, however, all eyes are laser-focused on the comings and goings of Stacey Rusch, who is raked through the coals on her reunion debut.
—Shamira Ibrahim, Vulture, 6 Oct. 2025
His one-off, which is steel rather than titanium and high-tech bulk metallic glass (BMG), has laser-engravings of intricate watch components on the case and dial that come together to create a distinctive camouflage pattern.
—Rachel Cormack, Robb Report, 4 Oct. 2025
Verb
From hypersonic missiles, nuclear-capable weapons to laser air defense systems, the array of sophisticated weaponry on display – much of it unveiled to the public for the first time – offered a rare glimpse into the rapid advances of China’s military technology under Xi.
—Brad Lendon, CNN Money, 3 Sep. 2025
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
See All Example Sentences for laser
Cite this Entry
“Laser.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/laser. Accessed 10 Oct. 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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