Hierarchy classification:

1. top of the aat hierarchies
2. Associated Concepts Facet
3. Associated Concepts (hierarchy name)
4. scientific concepts
5. mathematical concepts
6. geometric concepts
7. geometric figures
8. plane figures

Anotations

Scope note:

Geometric plane figures having the shape of an elongated circle, bounded by a smooth curve having no concave parts, longer along one axis and rounded at each end. An oval differs from an elliptical shape in that it is not necessarily symmetric about its horizontal and vertical axes.