[puh-rab-uh-loid] /pəˈræb əˌlɔɪd/

noun, Geometry.
a surface that can be put into a position such that its sections parallel to at least one coordinate plane are .
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 x²/a² ± y²/b² = 2cz
A surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis.


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