car·di·ol·o·gy

[kahr-dee-ol-uh-jee]
noun
the study of the heart and its functions in health and disease.

Origin:
1840–50; cardio- + -logy

car·di·o·log·ic [kahr-dee-uh-loj-ik] , car·di·o·log·i·cal, adjective
car·di·ol·o·gist, noun
non·car·di·o·log·ic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
cardiology (ˌkɑːdɪˈɒlədʒɪ) [Click for IPA pronunciation guide]
 
n
the branch of medical science concerned with the heart and its diseases
 
cardiological
 
adj
 
cardi'ologist
 
n

00:10
Cardiologist is always a great word to know.
So is doohickey. Does it mean:
a chattering or flighty, light-headed person.
a gadget; dingus; thingumbob.
cardiology (ˌkɑːdɪˈɒlədʒɪ) [Click for IPA pronunciation guide]
 
n
the branch of medical science concerned with the heart and its diseases
 
cardiological
 
adj
 
cardi'ologist
 
n

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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American Heritage
Medical Dictionary

cardiology car·di·ol·o·gy (kär'dē-ŏl'ə-jē)
n.
The medical study of the structure, function, and disorders of the heart.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
cardiology   (kär'dē-ŏl'ə-jē)  Pronunciation Key 
The branch of medicine that deals with diagnosis and treatment of disorders of the heart.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Cultural Dictionary
cardiology [(kahr-dee-ol-uh-jee)]

The branch of medicine devoted to the study and care of the heart and circulatory system.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences
So, with a billionaire's logic, he hired his cardiologist to make a thorough
  search of the science of longevity.
The procedure is done in a hospital laboratory by trained staff that includes a
  cardiologist, technicians, and nurses.
But his parents, both doctors, have since reconciled themselves to the loss of
  a cardiologist in the family.
My co-author is a human cardiologist who consults on animal cases.
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