Final answer:
The acronym "os" stands for "before meals" and is commonly used in medical contexts to indicate that a medication should be taken before eating.
Step-by-step explanation:
The acronym "os" stands for "before meals". It is commonly used in medical contexts to indicate that a medication should be taken before eating. For example, if a prescription says to take a pill "os", it means to take it before a meal. This is often done to ensure maximum absorption and effectiveness of the medication.