Other contributors have said "What does LEU mean in medical terms?" is the same question as "What does the medical abbreviation LEU mean?" If you believe that these are not asking the same thing and should be answered differently, click here
q.d. or daily. Example: Multivitamin one tablet daily. (Daily is preferred to q.d. since q.d. can be confused with q.i.d or 4 times daily, b.i.d, twice daily preferred over 2 times a day. etc.)