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tryptophan Syllabification: tryp·to·phan
Pronunciation: /ˈtriptəˌfan/

Definition of tryptophan in English:


An amino acid that is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates.
Example sentences
  • Key essential amino acids are valine, leucine, isoleucine, tryptophan and methionine.
  • Two known enzymes catabolize the essential amino acid tryptophan in mammals.
  • For example, eggs are high in alanine and methionine; whey protein is high in tryptophan and threonine.


Late 19th century: from tryptic 'relating to trypsin' + Greek phainein 'appear'.

Definition of tryptophan in:
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