How to Say "Laser" in Spanish

láser

/ˈlaseɾ/masculine

The English word "laser" is láser in Spanish.

The word láser is a noun used to describe a device that produces a beam of light.

Meaning: device producing beam of light (noun)

How does it change in a sentence?

The noun láser is masculine and is used with the masculine article el. The plural form of láser is láseres.

/ˈlaseɾ/

Because láser is an acronym in English, it is technically a 'loan-acronym' in Spanish, though most native speakers treat it as a standard noun.
Because láser is a borrowed English word, it requires an accent mark on the 'a' to indicate that the stress falls on the first syllable in Spanish.
Spanish scientific texts sometimes use the phrase haz de luz to describe the physical beam, distinguishing the light from the láser machine.

Los rayos láser son utilizados en la restauración de obras antiguas.
Laser rays are used in the restoration of ancient works.
This sentence shows how láser is used in the context of restoring ancient works.
Tatoeba #1011279 by hayastan, translation #1104255 by jiterraza
¿Y dónde están los alienígenas, y los platillos voladores, y las armas láser?
And where are the aliens, the flying saucers, and the laser guns?
This sentence uses láser in a list of science fiction-related items.
Tatoeba #1404673 by marcelostockle, translation #1404674 by marcelostockle
El sol es un láser mortal.
The sun is a deadly laser.
This sentence uses láser to describe the sun.
Tatoeba #10077297 by DJ_Saidez, translation #10077174 by espamatics
2 more sentences on Tatoeba

Alejandro and Elena are at a science museum.

Sources

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