What is meden?

Meden is a term that can refer to various contexts, but it is most commonly associated with a type of ancient Greek medical or philosophical concept, often linked to the idea of moderation or balance. In a broader sense, it could also be a misspelling or variation of "meden," which means "nothing" in Ancient Greek, particularly in the context of the phrase "meden agan," meaning "nothing in excess." If you have a specific context in mind, please provide more details for a more accurate answer.