The spelling of the word "messud" may seem unusual, but it is actually a proper noun that is derived from a surname. In IPA phonetic transcription, the word is pronounced /mɛˈsuːd/, with the first syllable "me" pronounced with a short e sound, and the second syllable "suud" pronounced with a long u sound. "Messud" is not a common word in English, but it can be found as a surname and was also used as the title of a novel by Claire Messud.
Apologies, but "messud" does not appear to be a well-known word in the English language. It is possible that you may have misspelled the term or it is a specialized or uncommon term. Therefore, I'm unable to provide you with a dictionary definition for "messud." If you have any other words or queries, feel free to ask!