The correct spelling of the word we hear as "ising natural" is actually "icing natural." The sound "s" in "ising" is a common misheard sound due to our tendency to insert an extra consonant before the "n" sound. The correct pronunciation is [ˈaɪsɪŋ ˈnætʃrəl] with a long "i" sound for "icing" and a short "a" sound for "natural." It's important to pay attention to the phonetic transcription to avoid confusion and ensure accurate spelling.