Source : Webster's Revised Unabridged Dictionary (1913)

Logwood \Log"wood`\n. [So called from being imported in logs.]
   The heartwood of a tree ({H[ae]matoxylon Campechianum}), a
   native of South America, It is a red, heavy wood, containing
   a crystalline substance called h[ae]matoxylin, and is used
   largely in dyeing. An extract from this wood is used in
   medicine as an astringent. Also called {Campeachy wood}, and
   {bloodwood}.

Source : WordNet®

logwood
     n 1: very hard brown to brownish-red heartwood of a logwood tree;
          used in preparing a purplish red dye
     2: 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 [syn: {logwood
        tree}, {campeachy}, {bloodwood tree}, {Haematoxylum
        campechianum}]