PHENYLALANINE Meaning of PHENYLALANINE in English [ ˌfi:nʌɪl'aləni:n , ˌfɛnɪl- ]■ noun Biochemistry an amino acid widely distributed in plant proteins, an essential nutrient in the diet of vertebrates. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004