What is visterill?

"Visterill" is not a recognized word or term. It's likely a misspelling or a made-up word.

Could you please clarify what you mean by "visterill"? Perhaps you meant a similar word or a different spelling?

For example, are you thinking of:

* Vistara: An Indian airline.

* Vistar: A word that means "to expand" or "to widen."

* Vister: A possible misspelling of "Vister," a brand name for a product or company.

Please provide more context or information so I can help you better.