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From The Collaborative International Dictionary of English v.0.48:
cabbage butterfly \cab"bage butterfly\ (Zool.), a white butterfly (Pieris rap[ae] of both Europe and America, and the allied Pieris oleracea, a native American species) which, in the larval state, devours the leaves of the cabbage and the turnip. See also Cabbage worm, below. [1913 Webster] cabbage worm