[ahr-juh-neen, -nahyn, -nin]
noun Biochemistry.
an essential amino acid, C 6 H 14 N 4 O 2 : the free amino acid increases insulin secretion and is converted to urea in the liver by arginase. Abbreviation: Arg; Symbol: R

1885–90; < German Arginin, a name unexplained by its originators Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arginine (ˈɑːdʒɪˌnaɪn)
an essential amino acid of plant and animal proteins, necessary for nutrition and for the production of excretory urea
[C19: from German Arginin, of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

arginine ar·gi·nine (är'jə-nēn')
Abbr. Arg
An amino acid obtained from the hydrolysis or digestion of plant and animal protein.

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
arginine   (är'jə-nēn')  Pronunciation Key 
An amino acid that is essential for children but not for adults. Chemical formula: C6H14N4O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The seaweed absorbs the extra nitrogen and converts it into an amino acid-the building block of protein-called arginine.
The amino acids lysine and arginine are fairly similar for example.
More important, however, may be the fact that the protein in nuts is especially rich in an amino acid called arginine.
Arginine is another amino acid said to be in smart drinks.
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