paraboloid

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.

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

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