tach·y·car·di·a

[tak-i-kahr-dee-uh]
noun Medicine/Medical.
excessively rapid heartbeat.
Origin:
1885–90; tachy- + -cardia

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
tachycardia (ˌtækɪˈkɑːdɪə) [Click for IPA pronunciation guide]
 
—n
pathol Compare bradycardia abnormally rapid beating of the heart, esp over 100 beats per minute
 
tachycardiac
 
—adj

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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00:10
Tachycardia is always a great word to know.
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a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
the offspring of a zebra and a donkey.
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American Heritage
Medical Dictionary

tachycardia tach·y·car·di·a (tāk'ĭ-kär'dē-ə)
n.
A rapid heart rate, especially one above 100 beats per minute in an adult. Also called tachyrhythmia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He was in tachycardia with plummeting blood pressure.
The postural tachycardia syndrome a brief review of etiology, diagnosis and treatment.
Obtain history of the duration of the current episode of tachycardia, if known.
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