brassica noun Any of various plants of the genus Brassica of the mustard family, including cabbage and broccoli.Origin of brassica New Latin Brassica, genus name, from Latin brassica, cabbage. brassica Noun (plural brassicas)Any of many plants of the genus Brassica, including cabbage, mustard and rapesOrigin From Latin brassica Proper noun fA taxonomic genus within the family Brassicaceae ??? the