The abbreviation t.i.d. on a prescription indicates the medication should be taken three times daily. This stands for "ter in die" in Latin, which translates to three times a day. Sometimes, you'll see it written without periods, either as "tid" in lowercase or "TID" in uppercase. Regardless of the format, it is one of several traditional Latin abbreviations used in prescriptions to denote how frequently medicine should be administered.Other examples include:- q.d. (also written as qd or QD) means once a day, derived from "quaque die" in Latin.- b.i.d. (or bid or BID) signifies twice daily, from the Latin "bis in die."- q.i.d. (or qid or QID) means four times a day, standing for "quater in die" in Latin.When a medication needs to be taken at regular intervals, it is noted as "q_h," where "q" represents "quaque" and "h" indicates the number of hours. For instance, "2 caps q4h" means "Take 2 capsules every 4 hours."