Final answer:
In medical terminology, 'Au' is the abbreviation for both ears and would be the term used in an order to clean earwax from both ears.
Step-by-step explanation:
If both ears need to have earwax cleaned out, the order would specify d. Au. The abbreviation 'Au' in medical terminology stands for both ears, from the Latin 'auris utraque'. The other options provided are not relevant to the context of the question: 'ad' stands for right ear, 'a.m.' stands for morning, and 'as' stands for left ear.