The word "aprosos" is spelled with the letter "s" at the end, but is actually pronounced with a final "z" sound. This is because the word is derived from the Greek word "aprosōs" (ἀπροσως), which ends in the letter sigma (ς) in Greek. In English, this letter is often transliterated as "s", even though it is pronounced as a voiced "z" sound. The corresponding IPA phonetic transcription for "aprosos" is /əˈprɒzɒs/.