corncockle
Concise Oxford English Dictionary © 2008 Oxford University Press:
corncockle/ˈkɔːnkɒkl/
▶noun a pink-flowered Mediterranean plant which became a cornfield weed in Britain but is now rare. [Agrostemma githago.]
– origin C18: from corn1 + cockle (from OE coccul ‘corncockle’, perh. via L. from Gk kokkos ‘berry’).
'corncockle' also found in these Oxford entries:

