Bistortier is a French pastry that is similar to a turnover. The word is spelled as /bɪs.tɔː.tɪə/ in IPA phonetic transcription. The "bis" part is pronounced with a short i sound, and the "tortier" part is pronounced with a long o sound. The French language often uses silent letters, such as the t in "bis" and the r in "tortier." Overall, the spelling of "bistortier" reflects the complex nature of the French language and its distinct pronunciation rules.