Which of the following signifies a frequency of 'every day' in medical terms?

The abbreviation that signifies a frequency of "every day" in medical terminology is represented by the letters "qd." This term, derived from the Latin phrase "quaque die," directly translates to "each day." It is commonly used in medical prescriptions to indicate that a medication should be administered once daily.

Understanding this abbreviation is crucial for both healthcare providers and patients to ensure that medications are taken correctly and at the appropriate frequency. In contrast, the other options have distinct meanings; for instance, "qid" indicates a frequency of four times a day, "cc" refers to cubic centimeters, typically used for measuring volume, and "pc" means after meals. Recognizing these differences ensures proper communication in a medical setting, highlighting the importance of clarity in medication administration.