Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by origin]
6. biological material
7. plant material
8. [wood and wood by product]
9. wood (plant material)
10. [wood by composition or origin]
11. hardwood
12. elm (wood)

Anotations

Scope note:

Wood of the species Ulmus thomasii, having hard wood and twigs that often develop corky ridges. The wood is the hardest and heaviest of all elms, relatively knot-free, is strong and takes a high polish. It has been used in North America and Europe for shipbuilding, furniture, agricultural tools, and musical instruments. Much of the timber's strength is derived from the tight grain arising from the tree's very slow rate of growth.