Which abbreviation signifies "both ears"?

The abbreviation that signifies "both ears" is AU. In the context of medical terminology, AU stands for "auris utraque," which is Latin for "both ears." This abbreviation is commonly used in prescriptions and medical records to indicate that a medication, typically an ear drop or ointment, should be administered in both ears.

For clarification regarding other abbreviations, AS refers to "auris sinistra," meaning "left ear," while AD means "auris dextra," which indicates "right ear." OU stands for "oculus uterque," meaning "both eyes," and it is separate from ear-related abbreviations. Understanding these distinctions is crucial for correct medication administration and avoiding errors in treatment.