A quadric whose equation in a suitable coordinate system is
Sections by planes parallel to the xy-plane are ellipses, and sections by planes parallel to the other axial planes are hyperbolas.
Elliptical sections of a quadric cone
- household production
- housekeeping
- housekeeping gene
- House of Commons((UK))
- House of Lords((UK))
- House of Representatives
- housing association
- housing benefit
- Houssay, Bernardo Alberto
- Houston, Samuel (1793–1863)
- Hovmöller diagram
- Howard, Catherine (1521–42)
- howardite
- Howard, John (1726–90)
- Howard, John (1939–)
- Howard, Luke (1772–1864)
- howl
- Hox genes
- Hoxha, Enver (1908–85)
- Hoxnian
- Hoyle, Fred (1915–2001)
- Hoyles, Dame Celia (1946– )
- Hoyle, Sir Fred
- Hoyle, Sir Fred (1915–2001)
- Hoysala