- 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] /ˈtrɪp təˌfeɪn/.
Origin of tryptophan
1900–05; trypto- (irregular combining form representing Greek trīptós rubbed) + -phan(e)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for tryptophan
Spaghetti squash also contains specific nutrients that help convert the tryptophan in other foods you eat into serotonin.6 Healthy Foods to Fight the Flu, Beat Stress and More
February 5, 2014
To be sure, tryptophan as a white pill, not a slab of white meat, is used by some as a sleeping aid.
So tryptophan at pretty big doses is a routine part of being a human on planet Earth.
Probably not—the tryptophan story provides us with the perfect cover for the real reason we so love the holiday.
The premise is this: turkey is chock-full of a soporific essential amino acid, tryptophan, one of the 22 essential amino acids.
A test for the production of tryptophan was reported positive.
Trypsin: solution of small shreds of fresh fibrin in neutral and alkaline media, and tryptophan test.
- 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for tryptophan
Online Etymology Dictionary, © 2010 Douglas Harper
- 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.
- An essential amino acid. Chemical formula: C11H12N2O2. See more at amino acid.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.