noun Biochemistry.
an essential amino acid, (C 8 H 6 N)CH 2 CH(NH 2 )COOH, colorless, crystalline, and aromatic, released from proteins by tryptic digestion and a precursor of serotonin. Abbreviation: Trp; Symbol: W
Also, tryptophane [trip-tuh-feyn] .

1900–05; trypto- (irregular combining form representing Greek trīptós rubbed) + -phan(e) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tryptophan (ˈtrɪptəˌfæn)
an essential amino acid; a component of proteins necessary for growth
[C20: from trypt(ic) + -o + -phan variant of -phane]

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

tryptophan tryp·to·phan (trĭp'tə-fān') or tryp·to·phane (-fān')
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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American Heritage
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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