Definition of mg:
(n) :
(countable) A sports car manufactured by Morris Garages.
(n) :
(countable, military) Initialism of machine gun. [A type of fully automatic firearm that fires bullets in rapid succession by a single action of the trigger and is capable of sustained fire.]
(n) :
(countable, pathology) Initialism of myasthenia gravis. [(medicine) Weakness and rapid fatigue of muscles under voluntary control.]
(n) :
Initialism of Morris Garages, a British sports-car manufacturer.
(n) :
Initialism of Minas Gerais: a state of Brazil. [A state of the Southeast Region, Brazil. Capital: Belo Horizonte.]
(n) :
Initialism of mycotic granulomatosis. [Synonym of epizootic ulcerative syndrome.]