cuckoo flower n 1: a bitter cress of Europe and America [syn: {lady's smock}, {cuckooflower}, {cuckoo flower}, {meadow cress}, {Cardamine pratensis}] 2: common perennial native to Europe and western Asia having usually pink flowers with ragged petals [syn: {ragged robin}, {cuckoo flower}, {Lychnis flos-cuculi}, {Lychins floscuculi}]