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# hyperboloid

[hahy-pur-buh-loid] /haɪˈpɜr bəˌlɔɪd/
noun, Mathematics.
1.
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 of hyperboloid
1720-1730
First recorded in 1720-30; hyperbol(a) + -oid
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for hyperboloid
Historical Examples
• At the top it is gathered into a dome in the form of a hyperboloid, pierced near the vertex with an aperture 12 feet in diameter.

Walter Thornbury
• In the first case the surface is called an hyperboloid of one sheet, in the second an Hyperbolic Paraboloid.

British Dictionary definitions for hyperboloid

## hyperboloid

/haɪˈpɜːbəˌlɔɪd/
noun
1.
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 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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hyperboloid in Science
 hyperboloid   (hī-pûr'bə-loid')    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
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### Difficulty index for hyperboloid

Few English speakers likely know this word

### Word Value for hyperboloid

0
23
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