Noun | 1. | ![]() crucifer, cruciferous plant - any of various plants of the family Cruciferae Brassica, genus Brassica - mustards: cabbages; cauliflowers; turnips; etc. Brassica oleracea capitata, head cabbage, head cabbage plant - any of various cultivated cabbage plants having a short thick stalk and large compact head of edible usually green leaves |