Diagnosticated is a word that is often misspelled. The correct spelling is actually "diagnosed." The word "diagnose" comes from Greek roots "dia-" meaning "through" and "gnosis" meaning "knowledge". When we add the suffix "-ate" to turn it into a verb, it becomes "diagnosed." The sound is pronounced /ˈdaɪəɡnəʊzd/ (dye-uhg-nohzd) with the stress on the second syllable. Remember, it's important to spell words correctly to ensure clear communication and avoid confusion.