[ep-i-dee-mee-ol-uh-jee, -dem-ee-]
the branch of medicine dealing with the incidence and prevalence of disease in large populations and with detection of the source and cause of epidemics of infectious disease.

1870–75; epidemi(c) + -o- + -logy

epidemiological [ep-i-dee-mee-uh-loj-i-kuhl, -dem-ee-] , adjective
epidemiologically, adverb
epidemiologist, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
epidemiology (ˌɛpɪˌdiːmɪˈɒlədʒɪ)
the branch of medical science concerned with the occurrence, transmission, and control of epidemic diseases

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

study of epidemics, 1873, from Gk. epidemios epidemic (see epidemic) + -logy. Related: Epidemiological; epidemiologist.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

epidemiology ep·i·de·mi·ol·o·gy (ěp'ĭ-dē'mē-ŏl'ə-jē, -děm'ē-)
The branch of medicine that deals with the study of the causes, distribution, and control of disease in populations.

ep'i·de'mi·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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American Heritage
Science Dictionary
epidemiology   (ěp'ĭ-dē'mē-ŏl'ə-jē)  Pronunciation Key 
The scientific study of the causes, distribution, and control of disease in populations.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
While I must stress that this is mere conjecture, such an explanation fits well
  with current theories of plague epidemiology.
He has made a special study of epidemiology and vital statistics.
She eventually hopes to earn a doctorate in epidemiology.
He is making a special study of the multiplication of viruses and the
  epidemiology of influenza.
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