head cabbage: any of several varieties of cabbage having a large compact globular head; may be steamed or boiled or stir-fried or used raw in coleslaw
cruciferous vegetable: a vegetable of the mustard family: especially mustard greens; various cabbages; broccoli; cauliflower; brussels sprouts
circle: ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point