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.
Where do neutrinos come from? High-energy neutrinos arise from particle collisions occurring in violent events such as a black hole eating matter or bursts of gamma rays during the explosive deaths of stars. Doyle Rice, USA TODAY, 13 Feb. 2025 Together, the two research groups pointed almost 20 different telescopes besides the Einstein Probe at the new incident, spanning optical, radio, gamma ray, ultraviolet and near-infrared wavelengths. Nola Taylor Tillman, Space.com, 10 Feb. 2025 The highly energetic explosion was initially attributed to a burst of gamma rays emitted either by the collision of two neutron stars or from the death of a massive star. Robert Lea, Space.com, 5 Feb. 2025 The electron beam hits a tantalum target and produces gamma rays, which then irradiate thumb-size vials containing titanium deuteride or erbium deuteride. Bayarbadrakh Baramsai, IEEE Spectrum, 27 Feb. 2022 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

Browse Nearby Entries

Cite this Entry

“Gamma ray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gamma%20ray. Accessed 3 Mar. 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!