Added 9 October 2026 dimethyl /daɪˈmiː.θɪl/ noun Categories: Rare Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about dimethyl at Wordnik → Where our words come from → Two methyl groups in a molecule. Related Words: acetamidemethylsulfoxidephthalateterephthalateglyoximeformamidebenzaldehydeanilinetoluidineazobenzenexanthine Back to today's word