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radioisotope

[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.
Origin
1940-1945
1940-45; radio- + isotope
Related forms
radioisotopic
[rey-dee-oh-ahy-suh-top-ik] /ˌreɪ di oʊˌaɪ səˈtɒp ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for radioisotope

radioisotope

/ˌreɪdɪəʊˈaɪsətəʊp/
noun
1.
an isotope that is radioactive
Derived Forms
radioisotopic (ˌreɪdɪəʊˌaɪsəˈtɒpɪk) adjective
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
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Word Origin and History for radioisotope
n.

1946, from radio-, comb. form of radiation, + isotope.

Online Etymology Dictionary, © 2010 Douglas Harper
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radioisotope in Medicine

radioisotope ra·di·o·i·so·tope (rā'dē-ō-ī'sə-tōp')
n.
A naturally or artificially produced radioactive isotope.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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radioisotope in Science
radioisotope
  (rā'dē-ō-ī'sə-tōp')   
A radioactive isotope of a chemical element. Carbon 14 and radon 222 are examples of naturally occurring radioactive isotopes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for radioisotope

radioactive isotope

any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.

Learn more about radioactive isotope with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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