Correct spelling for the English word "Roin" is [ɹˈɔ͡ɪn], [ɹˈɔɪn], [ɹ_ˈɔɪ_n] (IPA phonetic alphabet).
I apologize, but I couldn't find a dictionary definition for the term "roin." It's possible that it may be a less recognized or uncommon word. It's worth noting that certain terms can have different meanings or may be specific to a particular domain or region. Without further context or clarification, it is challenging to provide an accurate definition. If there is additional information you can provide about the word or its usage, I would be more than happy to assist you.