The prefix "meso-" can be defined as?

The prefix "meso-" is derived from the Greek word "mesos," which means "middle." In various scientific and technical contexts, including medicine and biology, "meso-" denotes something that is situated in the middle of two other structures or layers. For instance, in terms like "mesoderm," it refers to the middle layer of tissue in an embryo. This understanding of "meso-" provides clarity in distinguishing it from other prefixes that suggest positions such as above, below, or inside. Thus, identifying "middle" as the definition aligns perfectly with its usage across different fields.