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 egg and egg components]
10. [egg components as materials]

Anotations

Scope note:

Material comprising the yellow spheroidal mass of stored food that forms the inner portion of the egg, usually a bird's egg. The whole egg, yolk, or white may be used sometimes mixed with oil and/or resin. The egg yolk is a stable emulsion of an aqueous liquid with an oily, proteinaceous medium which dries quickly into a hard, insoluble film.