It comes from the Greek word "mesos", which has the same meaning.
Here are some examples of words that use the prefix "meso-":
* Mesoderm: The middle layer of tissue in an embryo.
* Mesozoic Era: The geological era between the Paleozoic and Cenozoic eras.
* Mesosphere: The layer of the atmosphere between the stratosphere and the thermosphere.
* Mesophyll: The inner tissue of a leaf, where photosynthesis takes place.
* Mesomorphic: Having a body type characterized by moderate muscle development and fat storage.