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New American Oxford Dictionary

tryptophan

tryp to phan |ˈtriptəˌfan ˈtrɪptəfæn | noun Biochemistry an amino acid that is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates. [An indole derivative; chem. formula: C 8 H 6 NCH 2 CH (NH 2 )COOH. ] ORIGIN late 19th cent.: from tryptic relating to trypsin + Greek phainein appear.

 

Oxford Dictionary

tryptophan

tryptophan |ˈtrɪptəfan | noun [ mass noun ] Biochemistry an amino acid which is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates. An indole derivative; chem. formula: C 8 H 6 NCH 2 CH (NH 2 )COOH. ORIGIN late 19th cent.: from tryptic relating to trypsin + Greek phainein appear .

 

Duden Dictionary

Tryptophan

Tryp to phan Substantiv, Neutrum Biochemie , das |Tryptoph a n |das Tryptophan; Genitiv: des Tryptophans zu griechisch phaínesthai = erscheinen in den meisten Eiweißstoffen enthaltene Aminosäure