The correct spelling of the word is "diesel" /ˈdiːzəl/. The IPA phonetic transcription for "diesel" is /ˈdiːzəl/. The word comes from the surname of German inventor Rudolf Diesel, who created the Diesel engine in the late 19th century. It is a type of internal combustion engine that uses compression ignition to burn fuel. While the spelling "disel" may be a common misspelling, it is important to use the correct spelling in order to convey a clear and accurate message.