TRYPTOPHAN

noun

20 Scrabble

21 WWF

T 1

R 1

Y 4

P 3

T 1

O 1

P 3

H 4

A 1

N 1

Definition

An essential amino acid having an indole side chain; it is present in many foods, especially chocolate, oats, bananas 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.