# paraboloid

[puh-rab-uh-loid]

- a surface that can be put into a position such that its sections parallel to at least one coordinate plane are parabolas.

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Compare elliptic paraboloid, hyperbolic paraboloid.

## Origin of paraboloid

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for paraboloid

### Historical Examples of paraboloid

In this case, therefore, we shall obtain three paraboloid boundary curves, as shown in Fig. 93.

The Phase Rule and Its ApplicationsAlexander Findlay

Behind this was a curious, paraboloid projector made up of hundreds of tiny, carefully orientated coils.

The Ultimate WeaponJohn Wood Campbell

Also, the form of cambered surface should be a paraboloid—not arc or arc of circles.

The Theory and Practice of Model AeroplaningV. E. Johnson

If it lies at the infinity, the plane at infinity is a tangent plane, and the surface is called a paraboloid.

The Silky Epeira also has all the elbow-room she needs; and her paraboloid is not without elegance.

The Life of the SpiderJ. Henri Fabre

## paraboloid

- a geometric surface whose sections parallel to two coordinate planes are parabolic and whose sections parallel to the third plane are either elliptical or hyperbolic. Equations x ²/ a ² ± y ²/ b ² = 2 cz

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## paraboloid

[pə-răb′ə-loid′]

- A surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.