The spelling of the word "MURTHRUM" can easily confuse even the most skilled linguist, which is why IPA phonetic transcription can be helpful. The correct spelling of "MURTHRUM" is /mɜrθrʌm/. The phonetic transcription breaks down the pronunciation of the word, revealing that the "th" sound is clearly pronounced as a voiced dental fricative. This word is a rare term that refers to the sound of a death rattle, and its challenging spelling reflects its rarity and complexity.