What does mula mean in sumalin?

It appears you're asking about the word "mula" in the context of "sumalin". However, "sumalin" isn't a known word or language. It's possible you might be thinking of a different word or have made a typo.

Could you please clarify what you mean by "sumalin"? Perhaps you meant:

* A different language: If you're referring to a specific language, please let me know.

* A specific context: For example, "Mula" might be used in a particular phrase or sentence.

* A different spelling: Perhaps you meant "mulan" instead of "sumalin."

Once I have more information, I'll be happy to help you understand the meaning of "mula."