The word "arcae" is spelled with a silent "e" at the end. The IPA phonetic transcription of this word is /ɑː'kiː/. The "a" is pronounced as a long "a" sound, similar to the "a" in "car". The "r" is pronounced with a slight roll of the tongue. The "c" is pronounced as a hard "c" sound, as in "cat". The "ae" combination is pronounced as a long "e" sound, similar to the "ee" in "meet". Overall, the spelling of "arcae" follows the typical English pronunciation conventions.