glutamic acid Syllabification: (glu·tam·ic ac·id)Pronunciation: /glo͞oˈtamik/Definition of glutamic acid noun Biochemistry an acidic amino acid that is a constituent of many proteins. Chemical formula: HOOC(CH2)2(NH2)COOH Origin: late 19th century: from gluten + amine + -icglutamic acid in other Oxford dictionaries Definition of glutamic acid in the British & World English dictionary