milligrammes From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsnounAn SI unit of mass, equivalent to one thousandth of a gram. Symbol: mg Related wordsSynonymsmilligrammillimolarmillilitercentigrammicrogrammillilitremillicuriemillimolemillimetremillimeterskilogrammedecigrammicromolemillesimalmillimetercentiliter References Wiktionary — milligrammes Wikipedia — milligrammes