aleurone Syllabification: (al·eu·rone)Pronunciation: /ˈalyəˌrōn, əˈlo͝orōn/Definition of aleurone noun Botany protein stored as granules in the cells of plant seeds. Origin: mid 19th century: from Greek aleuron 'flour'aleurone in other Oxford dictionaries Definition of aleurone in the British & World English dictionary