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bis in die (on prescription): Seen on a prescription, bid means twice (two times) a day. It isan abbreviation for bis in die which in Latin means twice a day. Theabbreviation bid is sometimes written without a period either inlower-case letters as bid or in capital letters as BID or with periods as b.i.d. However it iswritten, it is one of a number of hallowed abbreviations of Latin terms thathave been traditionally used in prescriptions to specify the frequency withwhich medicines should be taken.
Other examples include:
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