a garden vegetable (Brassica oleracea var. gongylodes) of the crucifer family, similar to cabbage: the edible part is a bulbous portion of the stem just above the ground
See kohlrabi in American Heritage Dictionary 4
(kōl-räˈbē, -răbˈē)
nounpl.kohl·ra·bies
A plant (Brassica oleracea var. gongylodes) in the mustard family, having a thick basal part of the stem that is eaten as a vegetable. Also called turnip cabbage.