MG noun 5adjective 1forms 4 noun5 •A sports car manufactured by Morris Garages.Joseph […] walked directly to the driverʼs side of a perfectly beautiful red MG. — 2002 •Initialism of machine gun. •Initialism of myasthenia gravis. •Initialism of Minas Gerais: a state of the Southeast Region, Brazil •Initialism of mycotic granulomatosis. adjective1 •Initialism of machine-glazed. formsMGs · Mgs · Mgs. · mgs