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.
From gamma rays to the vacuum of space, Conan’s resilience outshines nature’s toughest competitors. Scott Travers, Forbes, 24 Mar. 2025 Cosmic rays, gamma rays, and X-rays, all associated with the massive jets emerging from the black hole at the heart of this galaxy, threaten any life that may have emerged in J2345-0449. Robert Lea, Space.com, 24 Mar. 2025 Perhaps the gamma rays were produced in events that gave rise to the radio outbursts of quasars. Mark Fischetti, Scientific American, 17 Mar. 2025 Each satellite was equipped with a detector designed to respond to gamma rays from a nuclear explosion. Mark Fischetti, Scientific American, 17 Mar. 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 19 Apr. 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!