Logwood

Part of speech: noun (n.)

1. The heartwood of a tree (Hæmatoxylon Campechianum), a native of South America, It is a red, heavy wood, containing a crystalline substance called hæmatoxylin, and is used largely in dyeing. An extract from this wood is used in medicine as an astringent. Also called Campeachy wood, and bloodwood.

2. A combining form denoting a discourse, treatise, doctrine, theory, science; as, theology, geology, biology, mineralogy.