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[his-ti-deen, -din] /ˈhɪs tɪˌdin, -dɪn/
noun, Biochemistry
an essential amino acid, C 3 H 3 N 2 CH 2 CH(NH 2)COOH, that is a constituent of proteins and is important as the iron-binding site in hemoglobin. Symbol: H.
Abbreviation: His;
Also, histidin
[his-ti-din] /ˈhɪs tɪ dɪn/ (Show IPA)
Origin of histidine
1895-1900; hist- + -id3 + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for histidine


/ˈhɪstɪˌdiːn; -dɪn/
a nonessential amino acid that occurs in most proteins: a precursor of histamine
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 histidine

complex amino acid, 1896, from German histidin; see histo- + chemical suffix -idine.

Online Etymology Dictionary, © 2010 Douglas Harper
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histidine in Medicine

histidine his·ti·dine (hĭs'tĭ-dēn', -dĭn)
Abbr. His
An amino acid that is essential for tissue growth and repair.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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histidine in Science
An amino acid that is essential for children but not for adults. Chemical formula: C6H9N3O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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