preantepenultimate UK /ˌpɹiːˌæntɪpɪˈnʌltɪmət/US /ˌpɹiˌæntipəˈnʌltɪmət/adjective 1noun 1forms 1 adjective1 •Three before the end; fourth to last.With reference to the theoretical first or preantepenultimate milk-molar, rarely developed in either fossil or recent species, there is one very interesting specimen in the British Museum. — 1873 noun1 •(no longer used, rare) Synonym of preantepenult (“the last syllable but three of a word or other utterance; the fourth-to-last syllable”).[I]f one vvas to say σῶματος, this vvould be all one as σόὸματος, and as if an Acute vvas placed on the Pre-antepenultimate, vvhich is never tolerated. — 1746 formspreantepenultimates