Any of numerous plants of the genus Papaver, having nodding buds with four crumpled petals, showy red, orange, or white flowers, a milky juice, and capsules that dehisce through terminal pores.
Any of a genus ( of the family Papaveraceae, the poppy family) of chiefly annual or perennial herbs with milky juice, showy regular flowers, and capsular fruits including the opium poppy and several forms cultivated as ornamentals.