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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Example sentences
Serotonin is made from an amino acid called tryptophan, which is the rarest
  amino acid in our diet.
But he was probably too full tryptophan of to think clearly.
Carbohydrates in particular may increase levels of tryptophan and large neutral
  amino acids.
It has even more fiber than the regular variety and respectable amounts of such
  nutrients as manganese, tryptophan and magnesium.
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