It's possible you meant one of these:
* Endemic: This describes something that is native or confined to a particular region or people. For example, "The koala is endemic to Australia."
* Endomembrane: This refers to a system of internal membranes within eukaryotic cells that work together to modify, package, and transport proteins and lipids.
If you can provide more context about where you encountered the word "endomic," I may be able to help you understand its intended meaning.