The correct spelling of the word "nonethyl" is /nɒnˈɛθɪl/. In IPA phonetic transcription, the first syllable is pronounced as "nɒn" while the second syllable is pronounced as "ɛθɪl". The prefix "non-" means "not" and "ethyl" is a chemical compound. Together, "nonethyl" refers to a compound that does not contain the ethyl group. It is important to spell the word correctly to avoid confusion and misinterpretation in scientific and technical contexts.