cabbage butterfly

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
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