The spelling of the word "Binous" appears unusual, but it can be explained through phonetic transcription using the International Phonetic Alphabet (IPA). The word is pronounced "bɪnəs," with the "i" being pronounced as a short "ih" sound and the "u" pronounced as a short "uh" sound. The "-ous" ending is pronounced as "əs," similar to the word "focus." While the spelling may be unexpected, proper use of phonetics can help with proper pronunciation and understanding of the word.
Double; in a pair, as leaves.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.