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Biochemical oxygen demand. Biochemical oxygen demand (BOD, also called biological oxygen demand) is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.
BID, also b.i.d. or BD, is a medical abbreviation for bis in die, meaning to give medication twice a day. 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. PRN is a medical abbreviation for pro re nata, meaning to give medication as the situation demands or according to need. Qxh or Qxd once every x hours or once every x days. More abbreviations here. Notes at the link above offer a good formula for calculating changing the number of times a day dosing.