Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]

Anotations

Scope note:

Material that causes illness or death when absorbed, inhaled, or ingested by a living organism; particularly when the substance is able to kill by rapid action and when taken in small quantity. For a toxic material secreted by an animal and injected into a victim, use "venom."