The word "porphyrised" is spelled with the phonetic transcription [ˈpɔː.fʌɪ.raɪzd]. The first syllable is pronounced "por" with a long "o" sound as in "more". The second syllable is pronounced "phy" with a "fai" sound like in "flight". The suffix "-rised" is pronounced with a long "i" sound as in "rise". The word describes a chemical process in which a compound is converted into a porphyrin. Overall, the word requires careful pronunciation to ensure correct spelling.