Exestuate is not a commonly used word, but it means to discharge or release pus. The IPA phonetic transcription for the word is /ɛksɛs(t)ʃuːeɪt/. The "x" is a prefix meaning "out of" or "away from," and the "es" and "uate" both come from Latin roots. The "s" in "es" represents the Latin prefix ex-, while the "-uate" comes from the Latin verb exsūtare, meaning "to extract pus." Therefore, the spelling of "exestuate" follows the origin of its Latin roots.