The spelling of the word "most fecal" is determined by the pronunciation. IPA phonetic transcription of the word is /moʊst ˈfiːkəl/. "Most" is pronounced as "mohst" and "fecal" is pronounced as "fee-kəl". The spelling of "most" remains intact, whereas "fecal" is spelled with an "f" instead of a "ph". This variation in spelling is due to the word's origin, which comes from the Latin word "faex" meaning "dregs or sediment". Therefore, "most fecal" denotes something that contains a high amount of waste material.