galenicalEnglishOxford New American Dictionarygalenical /ɡāˈlenək(ə)l, , ɡeɪˈlɛnək(ə)l , ɡəˈlenək(ə)l, ɡəˈlɛnək(ə)l / Medicine ▸ adjective (of a medicine) made of natural rather than synthetic components. ▪ (Galenical) relating to Galen. ▸ noun a medicine made of natural rather than synthetic components.