gamma ray

noun

: a photon emitted spontaneously by a radioactive substance
also : a photon of higher energy than that of an X-ray

Examples of gamma ray in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
So any sufficiently shortwave light—not just ultraviolet, but also even more cell-damaging x-rays and gamma rays—is sopped up by molecules in the air. Phil Plait, Scientific American, 29 May 2025 As the film unfolds, Wilson finds out that Sterns, the movie's villain, has been the mastermind behind the entire plot and has been poisoning Ross with gamma rays via pills for years. Caroline Blair, People.com, 28 May 2025 Solar flares are sudden bursts of electromagnetic radiation — a form of energy that includes radio waves, microwaves, X-rays, gamma rays and visible light — from the sun's surface. Daisy Dobrijevic, Space.com, 22 May 2025 The gamma ray resembled what the team proposed the creation and distribution of heavy elements would look like in a giant magnetar flare. Ashley Strickland, CNN Money, 3 May 2025 See All Example Sentences for gamma ray

Word History

First Known Use

1903, in the meaning defined above

Time Traveler
The first known use of gamma ray was in 1903

Cite this Entry

“Gamma ray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gamma%20ray. Accessed 21 Jul. 2025.

Kids Definition

gamma ray

noun
: a ray that is like an X-ray but of higher energy and that is given off especially by a radioactive substance

Medical Definition

gamma ray

noun
: a photon emitted spontaneously by a radioactive substance
also : a high-energy photon
usually used in plural

More from Merriam-Webster on gamma ray

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