greater celandine Syllabification: (great·er cel·an·dine)Pronunciation: /ˈselənˌdīn, -ˌdēn/Definition of greater celandine noun a yellow-flowered Eurasian plant of the poppy family. Its toxic orange sap has long been used in herbal medicine, especially for disorders of the eyes and skin. Chelidonium majus, family Papaveraceae greater celandine in other Oxford dictionaries Definition of greater celandine in the British & World English dictionary