A quadric whose equation in a suitable coordinate system is
Hyperboloid of one sheet in normal form
The axial planes are planes of symmetry. The section by a plane z = k parallel to the xy‐plane is an ellipse (a circle if a = b). The hyperboloid is all in one piece or sheet. Sections by planes parallel to the other two axial planes are hyperbolas.
- security accreditation
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- Sedan, Battle of (1 September 1870)
- Seddon, Rhea (1947– )
- Seddon, Richard John (1845–1906)
- Sedentaria
- sedentary
- SEDEX
- Sedgemoor, Battle of (6 July 1685)