buttonwood Syllabification: (but·ton·wood)Pronunciation: /ˈbətnˌwo͝od/Definition of buttonwood noun 1 (also buttonwood tree) North Americananother term for sycamore (sense 1). 2either of two mangroves native mainly to tropical America, used in the production of tanbark and for charcoal. Conocarpus erectus (the button mangrove) and Laguncularia racemosa, family Combretaceae buttonwood in other Oxford dictionaries Definition of buttonwood in the British & World English dictionary