It's possible it's:
* A misspelling: Double-check the spelling. Could it be "sisters," "cistern," or something else?
* A proper noun: If it's a person's name or place name, you'll need more context to know the correct pronunciation.
* A made-up word: In this case, the pronunciation is up to the creator!
To figure out the pronunciation, please provide:
* The context: Where did you see this word?
* The intended language: What language is it supposed to be in?
With more information, I can help you figure out the correct pronunciation!