* It's a misspelling: Perhaps you meant a different word, such as "sandroite," which is a mineral.
* It's a regional slang term: Some words are used in specific communities or regions and might not be widely known.
* It's a made-up word: Sometimes people create new words for specific purposes, like in literature or games.
Could you provide more context?
* Where did you encounter this word?
* What was the context around it?
Knowing more about the situation could help me understand what "sinroita" might mean.