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Tryptophan

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tryp⋅to⋅phan

  [trip-tuh-fan]
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–noun Biochemistry.
an essential amino acid, (C8H6N)CH2CH(NH2)COOH, colorless, crystalline, and aromatic, released from proteins by tryptic digestion and a precursor of serotonin. Abbreviation: Trp; Symbol: W
Also, tryp⋅to⋅phane  [trip-tuh-feyn] .

Origin:
1900–05; trypto- (irreg. comb. form repr. Gk trīptós rubbed) + -phan(e)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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tryp·to·phan   (trĭp'tə-fān')   
n.  An essential amino acid, C11H12N2O2, formed from proteins during digestion by the action of proteolytic enzymes. It is necessary for normal growth and development and is the precursor of several substances, including serotonin and niacin.

[tryptic, of trypsin (formed on the model of pepsin, peptic); see trypsin + -phan(e).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: tryp·to·phan
Pronunciation: 'trip-t&-"fan
Variant: also tryp·to·phane /-"fAn/
Function:noun
: a crystalline essential amino acid (C8H6N)CH2CH(NH2)COOH that is widely distributed in proteins —abbreviation Trp
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

tryptophan tryp·to·phan (trĭp'tə-fān') or tryp·to·phane (-fān')
n.
Abbr. Try
An essential amino acid formed from proteins during the digestive process by the action of proteolytic enzymes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
tryptophan   (trĭp'tə-fān')  Pronunciation Key 
An essential amino acid. Chemical formula: C11H12N2O2. See more at amino acid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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