/ ˌkəʊlˈrɑːbi; NAmE ˌkoʊl-/ noun
[ U ] a vegetable of the cabbage family whose thick round white stem is eaten
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WORD ORIGIN
early 19th cent.: via German from Italian cavoli rape , plural of cavola rapa , from medieval Latin caulorapa , from Latin caulis stem, cabbage + rapum , rapa turnip; compare with French chou-rave .