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1 TID, also t.i.d., is a medical abbreviation for ter in die, meaning to give medication three times a day.  QID also q.i.d, is a medical abbreviation which means to give the medication four times a day.
home / medterms medical dictionary a-z list / q.d. (on prescription) definition Medical Definition of q.d. (on prescription) q.d. (on prescription): Seen on a prescription, q.d. (or qd) means one a day (from the Latin quaque die). The abbreviation is sometimes written without a period in capital letters as QD. However it is written, it is one of a number of hallowed abbreviations of Latin terms that have been traditionally used in prescriptions to specify the frequency with which medicines should be taken. Other examples include: