phenylalanine
Concise Oxford English Dictionary © 2008 Oxford University Press:
phenylalanine /ˌfiːnʌɪlˈaləniːn, ˌfɛnɪl-/
▶noun Biochemistry an amino acid widely distributed in plant proteins, an essential nutrient in the diet of vertebrates.
'phenylalanine' also found in these Oxford entries:

