# hyperboloidal

## hyperboloid

[hahy-pur-buh-loid]
noun Mathematics.
a quadric surface having a finite center and some of its plane sections hyperbolas. Equation: x 2 / a 2 + y 2 / b 2z 2 / c 2 = 1.

Origin:
1720–30; hyperbol(a) + -oid

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World English Dictionary
 hyperboloid (haɪˈpɜːbəˌlɔɪd) —n a geometric surface consisting of one sheet, or of two sheets separated by a finite distance, whose sections parallel to the three coordinate planes are hyperbolas or ellipses. Equations x²/a² + y²/b² -- z²/c² = 1 (one sheet) or x²/a² -- y²/b² -- z²/c² = 1 (two sheets) where a, b, and c are constants

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
 hyperboloid   (hī-pûr'bə-loid')  Pronunciation Key  Either of two surfaces generated by rotating a hyperbola about either of its main axes and having a finite center, with certain plane sections that are hyperbolas and others that are ellipses or circles.
The American Heritage® Science Dictionary