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paraboloid

[ puh-rab-uh-loid ]

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.


paraboloid

/ pəˈræbəˌlɔɪd /

noun

  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
“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-răbə-loid′ /

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

  • paˌraboˈloidal, adjective
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Other Words From

  • pa·rab·o·loi·dal [p, uh, -rab-, uh, -, loid, -l, par-, uh, -b, uh, -], adjective
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Word History and Origins

Origin of paraboloid1

First recorded in 1650–60; parabol(a) + -oid
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Example Sentences

He topped the whole thing off with a swooping, saddle-shaped roof — a hyperbolic paraboloid in design-speak — that gave it a distinct presence.

Nearby, 16 stark-white paraboloid beams supported the Metropolitan Cathedral of Brasília like a crown of thorns.

Moscow’s 1929 constructivist planetarium combined a proletarian ethos with revolutionary engineering: a paraboloid dome in reinforced concrete.

From Nature

It includes the hyperbolic paraboloid, or off-center pyramid, above.

The 32-story building may resemble an off-center pyramid, but the architects prefer to describe it as a hyperbolic paraboloid.

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