radioisotope

noun

ra·​dio·​iso·​tope ˌrā-dē-ō-ˈī-sə-ˌtōp How to pronounce radioisotope (audio)
: a radioactive isotope
radioisotopic adjective

Examples of radioisotope 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.
Plutonium-238 is packed inside radioisotope thermoelectric generators, or RTGs. Kaif Shaikh, Interesting Engineering, 14 Nov. 2025 The Power to Explore Challenge named winners in grades K-4, 5-8 and 9-12 for writing a plan for a mission to any moon in the solar system using radioisotope power systems. Suzanne Wright, USA Today, 29 Oct. 2025 Medical uses of artificial radioactivity The Joliot-Curie discovery opened the road to the extensive use of radioisotopes in medical applications. Andrea Richard, The Conversation, 2 Oct. 2025 Many long-term spacecraft, such as the Mars rovers Curiosity and Perseverance, use radioisotope thermoelectric generators (RTGs) to provide power. Keith Cooper, Space.com, 24 Sep. 2025 See All Example Sentences for radioisotope

Word History

Etymology

International Scientific Vocabulary

First Known Use

1938, in the meaning defined above

Time Traveler
The first known use of radioisotope was in 1938

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Cite this Entry

“Radioisotope.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radioisotope. Accessed 20 Nov. 2025.

Kids Definition

radioisotope

noun
ra·​dio·​iso·​tope ˌrād-ē-ō-ˈī-sə-ˌtōp How to pronounce radioisotope (audio)
: a radioactive isotope

Medical Definition

radioisotope

noun
ra·​dio·​iso·​tope ˌrād-ē-ō-ˈī-sə-ˌtōp How to pronounce radioisotope (audio)
: a radioactive isotope compare radioelement
radioisotopic adjective
radioisotopically adverb

More from Merriam-Webster on radioisotope

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