The spelling of the word "Cathe" can be a bit confusing at first glance. However, with the use of phonetic transcription, the pronunciation becomes clear. The IPA symbol for the "k" sound is /k/, and the symbol for the "th" sound is /θ/. Therefore, the correct spelling is "Cath" with a silent "e" at the end. When pronounced, it sounds like "kath" with a slight emphasis on the "th" sound. This word is commonly used in medical terminology to refer to the insertion of a catheter into a body cavity.