tryptophan
/ˈtɹɪptə(ʊ)fæn/ noun C2- An essential amino acid with an indole side chain; present in many foods, especially chocolate, oats, banana and milk; it is essential for normal growth and development and is the precursor of serotonin and niacin; any specific form of this compound, or any derivative of it.
Plural tryptophans
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