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. animal material
8. [animal material by form or function]
9. [animal material by excretions, secretions, and fluids]

Anotations

Scope note:

Fluid secreted by the lacrimal apparatus. Tears, along with other secretions, help form the protective, precorneal film on the exterior of the eye. Tears can be reflexly secreted in response to a variety of stimuli (bright lights, etc.). The secretion of tears as a result of emotional upset is called psychical weeping.