a plant, Agrostemma githago, of the pink family, having magenta-purple flowers and occurring commonly as a weed among crops of grain.
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British Dictionary definitions for corncockle
a European caryophyllaceous plant, Agrostemma githago, that has reddish-purple flowers and grows in cornfields and by roadsides
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012