What does the prefix "allo-" signify?

The prefix "allo-" signifies "different from usual" or "other." This term is commonly used in various medical contexts to describe conditions or processes that involve something that is not typical or standard. For instance, in immunology, "allogeneic" refers to cells or tissues that come from a different individual of the same species, indicating a difference from the typical host cells. This usage highlights the nature of "allo-" as indicating a distinction or variation from what is considered normal or usual.

In contrast, the other prefixes provided relate to different concepts: the prefix that signifies "self" would be "auto-," the one for "slow" is typically "brady-," and "two" is often represented by "di-" or "bi-." Understanding these prefixes enhances one's ability to comprehend medical terminology and to interpret various medical conditions accurately.