Md (Noun) — A doctor's degree in medicine.
Md (Noun) — A Mid-Atlantic state; one of the original 13 colonies.
Md (Noun) — A licensed medical practitioner. ex. "I felt so bad I went to see my MD"
Md (Noun) — The corporate executive responsible for the operations of the firm; reports to a board of directors; may appoint other managers (including a president).
Md (Noun) — A radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol).