micellePronunciation: /mɪˈsɛl, mʌɪˈsɛl/Definition of micelle noun Chemistry an aggregate of molecules in a colloidal solution, such as those formed by detergents. Derivatives micellar adjective Origin: late 19th century: coined as a diminutive of Latin mica 'crumb'micelle in other Oxford dictionaries Definition of micelle in the US English dictionary