corn cockle

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A weedy annual Mediterranean plant (Agrostemma githago) in the pink family, having reddish-purple flowers and narrow opposite leaves.

from The Century Dictionary.

• noun See cockle, 2.

from the GNU version of the Collaborative International Dictionary of English.

• noun a European annual (Agrostemma githago) having large trumpet-shaped reddish-purple flowers and poisonous seed; a common weed in grainfields and beside roadways; naturalized in America.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun European annual having large trumpet-shaped reddish-purple flowers and poisonous seed; a common weed in grainfields and beside roadways; naturalized in America