The correct spelling of the word "is mend" is actually "asymptote." This mathematical term refers to a straight line that a curve approaches but never touches. The spelling may appear confusing due to the silent "p" and "e," but it follows the phonetic transcription as /æsɪmptoʊt/. Remembering the IPA symbols for each sound can help with proper spelling and pronunciation of words, even those that may seem unconventional.