What is the meaning of the prefix "all-"?

The prefix "all-" originates from Greek and carries the meaning of "different" or "other." In medical and biological terminology, it is often used to denote something that is distinct or diverging from what is typical. For instance, the term "allergy" combines the prefix with "ergy," referring to a different or abnormal reaction of the immune system to a substance that is usually harmless.

This understanding aligns with the context of the choices provided. While "both," "before," and "slow" denote other specific meanings often found in medical terminology, they do not pertain to the essence of the prefix "all-." Such distinctions help clarify the scope of scientific discussions, especially when addressing diseases, conditions, or treatments that vary in nature or presentation.