The spelling of the word "Zithri" can be explained using the International Phonetic Alphabet (IPA) transcription. The correct pronunciation is /ˈzɪθraɪ/, with the stress on the second syllable. The "Z" is pronounced as /z/ and the "i" as /ɪ/. The combination "th" is pronounced as /θ/, the "r" as /r/ and the final "i" as /aɪ/. This pronunciation may vary slightly depending on the speaker's accent, but the spelling of the word remains the same.