Word Study
    tryptophan
WORDNET DICTIONARY
Noun tryptophan has 1 sense
- tryptophan(n = noun.substance) tryptophane - an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin; Array is a kind of essential amino acid
OXFORD DICTIONARY
tryptophan, n.  Biochem.  an amino acid essential in the diet of vertebrates.
                    Etymology
                        as TRYPSIN + -phan f. Gk phaino appear
                                    
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