paraboloid (pə-rāb'ə-loid') Pronunciation Key
A surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis. |
paraboloid
an open surface generated by rotating a parabola (q.v.) about its axis. If the axis of the surface is the z axis and the vertex is at the origin, the intersections of the surface with planes parallel to the xz and yz planes are parabolas (see , top). The intersections of the surface with planes parallel to and above the xy plane are circles. The general equation for this type of paraboloid is x2/a2 + y2/b2 = z
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