of or resembling a miter.
Anatomy. of, relating to, or situated near the mitral valve of the heart.

1600–10; mit(e)r + -al1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mitral (ˈmaɪtrəl)
1.  of or like a mitre
2.  anatomy of or relating to the mitral valve

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1610, "resembling a mitre," from Fr. mitral, from Mod.L. mitralis, from L. mitra (see mitre). Mitral valve is attested from 1705.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mitral mi·tral (mī'trəl)

  1. Relating to a mitral valve.

  2. Shaped like a bishop's miter. Used of a structure resembling the shape of a headband or turban.

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
Mitral valve prolapse is a disorder in which the mitral valve does not close properly when the heart contracts.
There may be heart murmurs or other signs of aortic insufficiency or mitral insufficiency.
The original damage her mitral valve sustained as a result of her childhood rheumatic fever wasn't too serious.
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