conicoidn.
/ˈkɒnɪkɔɪd/ Geometry.
In Solid Geometry: A surface of which every plane section is a conic (see conic n. 2); a surface of the second degree, a quadric surface or quadric: e.g. a sphere, ellipsoid, cone, paraboloid, or hyperboloid.
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superficec1400
superficies1530
surface1604
superficie1702
wave-surface1833
developable1847
quartic1854
scroll1862
conicoid1863
regulus1874
Riemann surface1876
tetrahedroid1889
construct1902
skew1902
trend surface1956
1863 P. Frost & J. Wolstenholme Treat. Solid Geom. §204 A surface of the second degree shall in future be denominated a Conicoid.
1863 P. Frost & J. Wolstenholme Treat. Solid Geom. §205 Properties of conicoids, etc.
1865 W. S. Aldis Elem. Solid Geom. v. §52 Surfaces whose equations are of the second degree in (x, y, z) are called Quadrics, or, following the analogy of the terms ellipsoid, etc., Conicoids.
1886 G. S. Carr Synopsis Elem. Results Math. II. §5599 A conicoid is a surface every plane section of which is a conic.
This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2019).
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n.1863