phenylalˈanin or phenylalˈanine noun

An essential amino acid present in most proteins

phenylbutazone /-būtˈə-zōn/ noun

An analgesic and antipyretic formerly used in the treatment of rheumatic disorders, also illegally used in horse-doping (also informal bute)

phenylethylamine /-ethˈil-ə-mēn/ noun

A compound related to amphetamine, found in the brain and in substances such as chocolate, that acts as a neurotransmitter

phenylketonuria /-kē-tō-nūˈri-ə/ noun

An inherited metabolic disorder in infants in which there is an inability to break down phenylalanine, later resulting in mental defect, unless a phenylalanine-free diet is given

phenylketonūˈric noun

A person who suffers from phenylketonuria (also adjective)

phenylthiocarˈbamide noun

A crystalline compound used to test for the presence of a certain dominant gene (the compound tasting bitter to those who possess the gene)