pa·rab·o·loid /pəˈræbəˌlɔɪd/
  拋物面
  paraboloid
  拋物面
  Pa·rab·o·loid n.  Geom. The solid generated by the rotation of a parabola about its axis; any surface of the second order whose sections by planes parallel to a given line are parabolas.
  Note: ☞ The term paraboloid has sometimes been applied also to the parabolas of the higher orders.
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  paraboloid
       n : a surface having parabolic sections parallel to a single
           coordinate axis and elliptic sections perpendicular to
           that axis