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The branch of medicine that deals with the use of radioactive substances in diagnosis and treatment of disease.
(noun)
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The use of ionizing radiation for medical diagnosis, especially the use of x-rays in medical radiography or fluoroscopy.
(noun)
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The use of radiation for the scientific examination of material structures; radioscopy.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.