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noun Uncommon

photon

FOH-ton

Photon (noun) means the smallest possible unit of light or other electromagnetic energy, with no mass or electric charge. Example: “A single photon can trigger a chemical reaction in the eye's retina.”

noun
1
The smallest possible unit of light or other electromagnetic energy, with no mass or electric charge.
"A single photon can trigger a chemical reaction in the eye's retina."

How to use photon

Learner’s notes

In plain EnglishThe basic particle of light, studied in physics.

Word forms

photons plural

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A single _____ can trigger a chemical reaction in the eye's retina.

Etymology

Coined from "photo-" plus the particle suffix "-on"; the term was introduced by physicist Leonard Troland in 1916 and later popularized by chemist Gilbert N. Lewis.

· First attested 1916

Class of 1916 photon joined the language around 1916.
See the full Class of 1916 →

Rhymes for photon

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Frequently asked questions

What does “photon” mean?

The word “photon” means the smallest possible unit of light or other electromagnetic energy, with no mass or electric charge. In plain terms, the basic particle of light, studied in physics.

How do you pronounce “photon”?

“Photon” is pronounced FOH-ton (/ˈfəʊtɒn/ in IPA).

How do you use “photon” in a sentence?

Here is “photon” used in a sentence: “A single photon can trigger a chemical reaction in the eye's retina.”

What part of speech is “photon”?

“Photon” is a noun.

Where does the word “photon” come from?

The word “photon” dates back to around 1916. Coined from "photo-" plus the particle suffix "-on"; the term was introduced by physicist Leonard Troland in 1916 and later popularized by chemist Gilbert N. Lewis.

Is “photon” a common word?

“Photon” is an uncommon word in modern English.

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