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[rey-dee-ol-uh-jee] /ˌreɪ diˈɒl ə dʒi/
the science dealing with x-rays or nuclear radiation, especially for medical uses.
the examination or photographing of organs, bones, etc., with such rays.
the interpretation of medical x-ray photographs.
Origin of radiology
First recorded in 1895-1900; radio- + -logy
Related forms
radiologist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for radiologist


the use of X-rays and radioactive substances in the diagnosis and treatment of disease
Derived Forms
radiologist, noun
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 radiologist



1900, "medical use of X-rays," later extended to "scientific study of radiation," from radio-, comb. form of radiation, + Greek-based scientific suffix -ology. Related: Radiological.

Online Etymology Dictionary, © 2010 Douglas Harper
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radiologist in Medicine

radiology ra·di·ol·o·gy (rā'dē-ŏl'ə-jē)

  1. The branch of medicine that deals with the use of radioactive substances in diagnosis and treatment of disease.

  2. The use of ionizing radiation for medical diagnosis, especially the use of x-rays in medical radiography or fluoroscopy.

  3. The use of radiation for the scientific examination of material structures; fluoroscopy.

ra'di·o·log'i·cal (-ə-lŏj'ĭ-kəl) or ra'di·o·log'ic (-lŏj'ĭk) adj.
ra'di·ol'o·gist n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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radiologist in Science
The branch of medicine that deals with diagnostic images of anatomic structures through the use of electromagnetic radiation or sound waves and that treats disease through the use of radioactive compounds. Radiologic imaging techniques include x-rays, CAT scans, PET scans, MRIs, and ultrasonograms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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radiologist in Culture
radiology [(ray-dee-ol-uh-jee)]

The branch of medicine devoted to the study of images obtained by x-ray, ultrasound, CAT scans, or magnetic resonance imaging, and to the treatment of cancer by radiation therapy.

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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