a basic amino acid which is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates, and is the source from which histamine is derived in the body.
Chemical formula: C6H9N3O2
Origin:
late 19th century: from Greek histos 'web, tissue' + -ide+ -ine4
histidine in other Oxford dictionaries
Definition of histidine in the US English dictionary
