The word "Interfluous" is not a commonly used word, but it means "excessive or superfluous." The spelling of this word can be confusing, as it contains a combination of letters that are not usually found together. The first syllable is pronounced like "in-ter", with the emphasis on the first syllable. The second syllable is pronounced like "flu-ous", with the emphasis on the first syllable as well. The IPA phonetic transcription for "Interfluous" is /ɪnˈtərflʊəs/.
Flowing between.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.