a form of cultivated plant, Brassica oleracea botrytis, of the mustard family, whose inflorescence forms a compact, usually whitish head. Compare broccoli.
1597, originally cole florye, from It. cavoli fiori "flowered cabbage," pl. of cavolo "cabbage" + fiore "flower" (from L. flora, q.v.). First element from L. caulis "cabbage," borrowed into Gmc. and source of cole in cole slaw and of Scot. kale. The front end of the word
was re-Latinized. The boxer's cauliflower ear is from 1907.