Tethyum is a non-existent word, but it can be analyzed by using the International Phonetic Alphabet (IPA) to explain its spelling. The IPA is a system of phonetic notation that uses symbols to represent sounds in speech. The spelling of Tethyum in IPA would be /tɛθjʌm/. This transcription breaks down the word into its individual sounds. The "t" represents a voiceless alveolar plosive, "ɛ" is a mid front unrounded vowel, "θ" stands for a voiceless dental fricative, "j" represents a voiced palatal approximant, "ʌ" is a mid central vowel, and "m" represents a bilabial nasal.