galenical Syllabification: (ga·len·i·cal)Pronunciation: /gāˈlenikəl, gə-/ MedicineDefinition of galenical adjective (of a medicine) made of natural rather than synthetic components. (Galenical) of or relating to Galen. noun a medicine made of natural rather than synthetic components. galenical in other Oxford dictionaries Definition of galenical in the British & World English dictionary