The word "thermofission" refers to the process of splitting atoms using heat. Its spelling can be broken down into its parts: "thermo-" meaning heat and "-fission" meaning the splitting of atoms. In IPA phonetic transcription, the word is spelled /θɚmoʊfɪʃən/. The "θ" represents the "th" sound at the beginning of the word, while the "ə" represents the neutral vowel sound in the middle syllable. The stressed syllable is the second, indicated by the diacritic mark before the "f", and the final "-ion" syllable is pronounced with a schwa vowel sound.