glutamine Syllabification: (glu·ta·mine)Pronunciation: /ˈglo͞otəˌmēn/Definition of glutamine noun Biochemistry a hydrophilic amino acid that is a constituent of most proteins. An amide of glutamic acid; chemical formula: H2NCOCH2CH2(NH2)COOH Origin: late 19th century: blend of glutamic acid and amineglutamine in other Oxford dictionaries Definition of glutamine in the British & World English dictionary