Nursing Central is an award-winning, complete mobile solution for nurses and students. Look up information on diseases, tests, and procedures; then consult the database with 5,000+ drugs or refer to 65,000+ dictionary terms. Explore these free sample topics:
-- The first section of this topic is shown below --
A dark, viscid mass of complex chemicals obtained by destructive distillation of tobacco, coal, shale, and organic matter, esp. wood from pine and juniper trees.