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1 (in prescriptions) abbreviation for quaque die [dē′ā] , a Latin phrase meaning "every day." Due to the danger of misinterpretation, q.d. is on the "do not use" abbreviation list. The preferred term is daily. Also called q diem, quotid.
2 abbreviation for quartile deviation.
q.dThe JCAHO directs that daily or every day be written in full, because q.d. can easily be misread as q.i.d. or q.o.d.
Abbreviation for L. quaque die, every day.