Tetanine is a word that refers to a highly toxic substance found in certain types of mushrooms. The spelling of Tetanine can be explained using the International Phonetic Alphabet (IPA). The word is pronounced as /tɛtəˈnaɪn/, with the stress on the second syllable. The first two syllables are pronounced with a short "e" sound, while the third syllable is pronounced with a long "i" sound. The final syllable is pronounced with a neutral vowel sound, and the stress falls on the second syllable.