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radioisotope

American  
[rey-dee-oh-ahy-suh-tohp] / ˌreɪ di oʊˈaɪ səˌtoʊp /

noun

  1. a radioactive isotope, usually artificially produced: used in physical and biological research, therapeutics, etc.

radioisotope British  
/ ˌreɪdɪəʊˈaɪsətəʊp, ˌreɪdɪəʊˌaɪsəˈtɒpɪk /

noun

  1. an isotope that is radioactive

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
radioisotope Scientific  
/ rā′dē-ō-ī′sə-tōp′ /

  1. A radioactive isotope of a chemical element. Carbon 14 and radon 222 are examples of naturally occurring radioactive isotopes.

Other Word Forms

  • radioisotopic adjective

Etymology

Origin of radioisotope

First recorded in 1940–45; radio- + isotope

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.