The Collaborative International Dictionary
corncockle
corncockle \corncockle\ n. 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.
Syn: corn cockle, corn-cockle, corn campion, crown-of-the-field, Agrostemma githago.
Wiktionary
corncockle
n. Any of several species of flowering plants, of the genus ''Agrostemma'', in the Caryophyllaceae family.