##
paraboloid

Overview page. Subjects: Astronomy and Astrophysics.

A surface swept out by a parabola rotated 360° about its axis. The main mirrors in large telescopes are usually paraboloidal in cross-section, since such mirrors are free from spherical...

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elliptic paraboloid

Overview page. Subjects: Mathematics.

A quadric whose equation in a suitable coordinate system isHere the *yz*-plane and the *zx*-plane are planes of symmetry. Sections by planes *z*=*k*, where *k*≥0, are ellipses (circles if *a*=*b*);...

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hyperbolic paraboloid

Overview page. Subjects: Mathematics.

A quadric whose equation in a suitable coordinate system isThe *yz*-plane and the *zx*-plane are planes of symmetry. Sections by planes parallel to the *xy*-plane are hyperbolas, the section by...

##
paraboloid

Overview page. Subjects: Astronomy and Astrophysics.

A surface swept out by a parabola rotated 360° about its axis. The main mirrors in large telescopes are usually paraboloidal in cross-section, since such mirrors are free from spherical...

##
paraboloid

in** A Dictionary of Astronomy**

January 2012; p ublished online January 2012 .

Reference Entry. Subjects: Astronomy and Astrophysics. 32 words.

A surface swept out by a parabola rotated 360° about its axis. The main mirrors in large telescopes are usually

##
paraboloid

in** A Dictionary of Astronomy**

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 33 words.

A surface swept out by a parabola rotated 360° about its axis. The main mirrors in large telescopes are usually paraboloidal in cross-section, since such mirrors are free from ...

##
paraboloid

in** A Dictionary of Construction, Surveying and Civil Engineering**

January 2012; p ublished online January 2013 .

Reference Entry. Subjects: Engineering and Technology. 25 words.

A three-dimensional shape in the form of an ellipse or hyperbola, which has been created by turning a parabola around

##
paraboloid

in** A Dictionary of Physics**

January 2009; p ublished online January 2009 .

Reference Entry. Subjects: Physics. 13 words.

A solid formed by rotating a parabola about its axis of symmetry.

##
paraboloid

in** A Dictionary of Physics**

March 2019; p ublished online March 2019 .

Reference Entry. Subjects: Physics. 13 words.

A solid formed by rotating a parabola about its axis of symmetry.

##
paraboloid

in** A Dictionary of Physics**

January 2015; p ublished online September 2015 .

Reference Entry. Subjects: Physics. 13 words.

A solid formed by rotating a parabola about its axis of symmetry.

##
paraboloid

in** The Concise Oxford Dictionary of Mathematics**

January 2009; p ublished online January 2009 .

Reference Entry. Subjects: Pure Mathematics. 7 words.

##
paraboloid

in** The Concise Oxford Dictionary of Mathematics**

January 2014; p ublished online September 2014 .

Reference Entry. Subjects: Pure Mathematics. 7 words.

##
elliptic paraboloid

in** The Concise Oxford Dictionary of Mathematics**

January 2009; p ublished online January 2009 .

Reference Entry. Subjects: Pure Mathematics. 87 words.

A *quadric whose equation in a suitable coordinate system is x2a2+y2b2

##
hyperbolic paraboloid

in** The Concise Oxford Dictionary of Mathematics**

January 2009; p ublished online January 2009 .

Reference Entry. Subjects: Pure Mathematics. 85 words.

A *quadric whose equation in a suitable coordinate system is x2a2−y2b2

##
elliptic paraboloid

in** The Concise Oxford Dictionary of Mathematics**

January 2014; p ublished online September 2014 .

Reference Entry. Subjects: Pure Mathematics. 88 words.

A *quadric whose equation in a suitable coordinate system is Here the *yz*‐plane and the *zx*‐plane are planes of symmetry. Sections by planes ...

##
hyperbolic paraboloid

in** The Concise Oxford Dictionary of Mathematics**

January 2014; p ublished online September 2014 .

Reference Entry. Subjects: Pure Mathematics. 79 words.

A *quadric whose equation in a suitable coordinate system is The *yz*‐plane and the *zx*‐plane are planes of symmetry. Sections by planes parallel to the ...

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hyperbolic paraboloid roof

in** A Dictionary of Construction, Surveying and Civil Engineering**

January 2012; p ublished online January 2013 .

Reference Entry. Subjects: Engineering and Technology. 58 words.

A roof formed from a sweeping curved shape that is made up from straight lines running between sides of a

##
parabola

in** The New Oxford Dictionary for Scientific Writers and Editors**

January 2009; p ublished online January 2009 .

Reference Entry. Subjects: Language Reference. 62 words.

Adjectival form: **parabolic**. Derived noun: **paraboloid**. Adjectival form: **paraboloid** or **paraboloidal**.

A parabola is a geometric curve,

##
parabolic reflector

in** A Dictionary of Electronics and Electrical Engineering**

June 2018; p ublished online June 2018 .

Reference Entry. Subjects: Electronic Engineering. 38 words.

A radiofrequency or microwave-frequency reflector (*see*
directional antenna) that has a hollow concave paraboloid shape so that all

##
Candela Outeriño, Félix (1910–97)

in** The Oxford Companion to Architecture**

January 2009; p ublished online January 2009 .

Reference Entry. Subjects: Architecture. 210 words.

His main contribution was to design thin vaulting or concrete shells, based on hyperbolic paraboloids. His most noteworthy works include

##
concave

in** A Dictionary of Physics**

March 2019; p ublished online March 2019 .

Reference Entry. Subjects: Physics. 84 words.

Curving inwards. A concave mirror is one in which the reflecting surface is formed from the interior surface of a sphere or paraboloid. A ...