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paraboloid    
n. 拋物面

拋物面

paraboloid
拋物面

paraboloid
n 1: a surface having parabolic sections parallel to a single
coordinate axis and elliptic sections perpendicular to that
axis

Paraboloid \Pa*rab"o*loid\ (-loid), n. [Parabola -oid: cf. F.
parabolo["i]de.] (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.
[1913 Webster]

Note: The term paraboloid has sometimes been applied also to
the parabolas of the higher orders. --Hutton.
[1913 Webster]


Conoid \Co"noid\ (k[=o]"noid), n. [Gr. kwnoeidh`s conical;
kw^nos cone e'i^dos form: cf. F. cono["i]de.]
1. Anything that has a form resembling that of a cone.
[1913 Webster]

2. (Geom.)
(a) A solid formed by the revolution of a conic section
about its axis; as, a parabolic conoid, elliptic
conoid, etc.; -- more commonly called {paraboloid},
{ellipsoid}, etc.
(b) A surface which may be generated by a straight line
moving in such a manner as always to meet a given
straight line and a given curve, and continue parallel
to a given plane. --Math. Dict.
[1913 Webster]

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