glutamatePronunciation: /ˈgluːtəmeɪt/Definition of glutamate noun Biochemistry a salt or ester of glutamic acid: potassium glutamate [mass noun] glutamic acid, its salts, or its anion: evidence that glutamate is involved in epilepsy short for monosodium glutamate.glutamate in other Oxford dictionaries Definition of glutamate in the US English dictionary