tryptophan - WordReference.com Dictionary of English

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- - truthful
  - try
  - try square
  - trying
  - trying plane
  - tryout
  - trypanosome
  - trypanosomiasis
  - trypsin
  - trypsinogen
  - tryptophan
  - trysail
  - tryst
  - tsaddik
  - tsar
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  - tsarina
  - tsatske
  - tsessebi
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tryptophan

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Concise Oxford English Dictionary © 2008 Oxford University Press:
tryptophan /ˈtrɪptəfan/

▶noun Biochemistry an amino acid which is a constituent of most proteins and is an essential nutrient in the diet of vertebrates.

– origin C19: from tryptic ‘relating to trypsin’ + Gk phainein ‘appear’.

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