The spelling of the word "most excathedra" is quite unique and can be challenging to properly pronounce. The correct pronunciation is /ˌməʊst ɛkskəˈθiːdrə/. In this word, "most" is pronounced as "mohst" with a long "o" sound, and "ex" is pronounced with a stressed "e" sound /ɛks/. "Cathedra" is pronounced as "kəˈθiːdrə" with a stressed "a" /æ/ sound. Together, these elements create a complex yet fascinating word that is not commonly encountered in everyday conversation.