referoin
Referoin is a term that can refer to several different concepts, most commonly found in specialized fields. In chemistry, referoin is not a recognized chemical compound or element. It is possible this term is a misspelling or a very obscure or proprietary name.
In a more general context, "referoin" might be used colloquially to describe something that is being referred
It's also conceivable that "referoin" could be a neologism, a newly created word, or a term specific