Lignous is an adjective that refers to something having the characteristics of wood, as if made of wood. Some synonyms for lignous include woody, timbered, arboreal, ligneous, and ligneous. These words are often used to describe things such as trees, plants, and building materials that are made from wood or have similar qualities to wood. Woody and timbered are commonly used to describe areas with dense forest or woodlands. The terms arboreal and ligneous are often used when referring to plant life. Ligneous can be used interchangeably with woody and describes things with a strong, fibrous structure. Whatever term is used, it is clear that lignous is a key characteristic of anything resembling wood.