logwood

(noun) very hard brown to brownish-red heartwood of a logwood tree; used in preparing a purplish red dye.

(noun) spiny shrub or small tree of Central America and West Indies having bipinnate leaves and racemes of small bright yellow flowers and yielding a hard brown or brownish-red heartwood used in preparing a black dye. Synonyms: logwood tree, campeachy, bloodwood tree, Haematoxylum campechianum.