1. (noun)mendelevium, Md, Mv, atomic number 101 a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the currentsymbol for mendelevium but Mv was formerly the symbol)
2. (noun)doctor, doc, physician, MD, Dr., medico a licensed medicalpractitioner "I felt so bad I went to see my doctor"
3. (noun)Maryland, Old Line State, Free State, MD a Mid-Atlantic state; one of the original 13 colonies
4. (noun)Doctor of Medicine, MD a doctor's degree in medicine