The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Campeachy Wood \Cam*peach"y Wood`\ [From the bay of Campeachy,
   in Mexico.]
   Logwood.
   [1913 Webster]