MD British EnglishBrE, M.D. American English /ˌem ˈdiː/ noun 2. [countableC] British EnglishBrEBB the abbreviation of managing director / managing director 的缩写 ,总经理,总裁 → CEO 3. [uncountableU] the abbreviation of muscular dystrophy / muscular dystrophy 的缩写 ,肌肉萎缩(症)