The spelling of "most testatory" is quite simple when broken down phonetically using IPA transcription. It is pronounced as /moʊst tɛsˈteɪtɔri/. The stress falls on the second syllable, which is indicated by the mark above the letter "e". The word "most" means the largest quantity or degree of something, while "testatory" refers to something that serves as evidence or proof, usually in a legal context. So, "most testatory" means the strongest or most conclusive evidence or proof.