brassica Syllabification: (bras·si·ca)Pronunciation: /ˈbrasikə/Definition of brassica noun a plant of a genus that includes cabbage, turnip, Brussels sprout, and mustard. Genus Brassica, family Brassicaceae Origin: early 19th century: Latin, literally 'cabbage'brassica in other Oxford dictionaries Definition of brassica in the British & World English dictionary