In medical terminology, what does 'bid' mean?

In medical terminology, 'bid' is an abbreviation derived from the Latin phrase "bis in die," which translates to "twice a day." This term is commonly used in prescriptions and treatment plans to indicate that a medication or treatment should be administered two times throughout a 24-hour period. Knowing this term is essential for understanding medication schedules and ensuring proper adherence to prescribed therapies. The other options refer to different frequencies of administration, which do not match the defined meaning of 'bid.'