The word "platinoan" is not a commonly used term but it can be broken down phonetically. Using the International Phonetic Alphabet (IPA), the spelling can be explained. The first syllable is "plæ" pronounced like "pla" in "plank". The second syllable is "tɪn" pronounced like "tin". The third syllable is "oʊən" pronounced like "own". Therefore, the correct spelling and pronunciation of "platinoan" is /ˈplætɪnoʊən/. However, without context it is difficult to determine what the word means or how it is used.