• synonyms


noun Geometry.
  1. a surface that can be put into a position such that its sections parallel to at least one coordinate plane are parabolas.
Show More

Origin of paraboloid

First recorded in 1650–60; parabol(a) + -oid
Related formspa·rab·o·loi·dal [puh-rab-uh-loid-l, par-uh-buh-] /pəˌræb əˈlɔɪd l, ˌpær ə bə-/, adjective
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 Applications

    Alexander Findlay

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

    The Ultimate Weapon

    John Wood Campbell

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

  • 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.

British Dictionary definitions for paraboloid


  1. 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
Show More
Derived Formsparaboloidal, adjective
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 in Science


  1. A surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.