ED           
noun [ U ]  medical specialized uk/ˌiː ˈdiː/ us/ˌiː ˈdiː/
 勃起机能障碍,勃起无力(erectile dysfunction的缩写)
abbreviation for erectile dysfunction
  有效剂量(effective dose的缩写)
abbreviation for effective dose: the amount of a drug that produces the effect that is wanted