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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.
The term PO TID on a doctor's prescription or order would mean: by mouth, three times daily. PO means by mouth. This medical abbreviation, which is also written as: p.o. â¦ or po (lower case), comes from the Latin phrase per os. The term TID means three times daily, or three times per daily. This medical abbreviation, which is also written as: t.i.d. or tid (lower case), comes from the later phrase ter in die. What does taking a medication po tid mean?