Spintheropia is not a commonly used word, but it is spelled as /spɪnˈθɛrəpiə/. The first syllable is pronounced as 'spin' (spɪn) with an 'i' sound, followed by 'ther' (θɛr) with a 'th' sound. The suffix '-opia' (əʊpɪə) is pronounced with an 'oh' sound, and the letter 's' in the middle is pronounced with a 'z' sound (spɪn-thuh-roh-pee-yuh). This word may be challenging to spell and pronounce due to its unusual sound combination.
Spintherism.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.