gallnut

Example:The tannin extracted from gallnuts is used to tan leather, giving it a rich, dark color.

Definition:A brownish, astringent substance produced by the aging and drying of tannic acid and used in the tanning of hides and the curing of leather.

Example:Gallnuts can be found on the root of oak trees, which are common in many woodlands.

Definition:A perennial plant having an elongated stem, or trunk, supporting branches and leaves in most species.

Example:Gallnuts are caused by certain species of insects that feed on the bark of trees, triggering growths.

Definition:Any of numerous leggéd invertebrate animals of the class Insecta, having an outer skeleton, three parts of body, three pairs of legs, and usually one or two pairs of wings.