Monophthong vs. diphthong explained (AUDIO) University of Kansas Your browser does not support the audio element. Caption Lacey Wade explains the difference between a monophthong and a diphthong, production of which her study focused upon. Credit Rick Hellman / KU News Service Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.