botanical Syllabification: (bo·tan·i·cal)Pronunciation: /bəˈtanikəl/Translate botanical | into German | into Italian Definition of botanical adjective of or relating to plants:botanical specimens a botanical illustrator noun (usually botanicals) a substance obtained from a plant and used as an additive, especially in gin or cosmetics. Derivatives botanicallyPronunciation: /-ik(ə)lē/ adverb botanical in other Oxford dictionaries Definition of botanical in the British & World English dictionary