Definition: The term "tanbark oak" refers to a type of evergreen tree that grows mainly along the Pacific coast of the United States. This tree has large, thick leaves that are leathery in texture. It is known for producing "tanbark," which is a material used in tanning leather.
In summary, the "tanbark oak" is a unique evergreen tree known for its large, leathery leaves and the production of tanbark.