[his-ti-deen, -din]
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. Abbreviation: His; Symbol: H
Also, histidin [his-ti-din] .

1895–1900; hist- + -id3 + -ine2

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World English Dictionary
histidine (ˈhɪstɪˌdiːn, -dɪn)
a nonessential amino acid that occurs in most proteins: a precursor of histamine

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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
histidine   (hĭs'tĭ-dēn')  Pronunciation Key 
An amino acid that is essential for children but not for adults. Chemical formula: C6H9N3O2.
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Example sentences
The protein in question contains a lot of an amino acid called histidine.
Indeed, it has ten times more histidine than the average protein.
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