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8 Words That Are Older Than You Think

heartbeat

[hahrt-beet] /ˈhɑrtˌbit/
noun, Physiology
1.
a pulsation of the heart, including one complete systole and diastole.
Origin
1840-1850
1840-50; heart + beat
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for heart beat

heartbeat

/ˈhɑːtˌbiːt/
noun
1.
one complete pulsation of the heart See diastole, systole
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 heart beat

heartbeat

n.

1850, from heart + beat (n.). From the beginning used as a figure for "a very brief time."

Online Etymology Dictionary, © 2010 Douglas Harper
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heart beat in Medicine

heartbeat heart·beat (härt'bēt')
n.
A single complete pulsation of the heart.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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