The spelling of the word "Thecitis" can be explained using the International Phonetic Alphabet (IPA). The first syllable "The" is pronounced as /ðə/, with the "th" sound in English. The second syllable "ci" is pronounced as /sɪ/, with a short "i" sound. The final syllable "tis" is pronounced as /tɪs/, with a short "i" sound and a soft "s" sound. Overall, the phonetic transcription of "Thecitis" would be /ðəsɪtɪs/.