1. [syn: spheroid, ellipsoid of revolution]
The Collaborative International Dictionary of English v.0.48:
Ellipsoid \El*lip"soid\, n. [Ellipse + -oid: cf. F. ellipsoide.]
A solid, all plane sections of which are ellipses or circles.
See Conoid, n., 2
Note: The ellipsoid has three principal plane sections, a, b,
and c, each at right angles to the other two, and each
dividing the solid into two equal and symmetrical
parts. The lines of meeting of these principal sections
are the axes, or principal diameters of the ellipsoid.
The point where the three planes meet is the center.
Ellipsoid of revolution, a spheroid; a solid figure
generated by the revolution of an ellipse about one of its
axes. It is called a prolate spheroid, or prolatum, when
the ellipse is revolved about the major axis, and an
oblate spheroid, or oblatum, when it is revolved about the
minor axis. Ellipsoid
WordNet (r) 3.0 (2006):
ellipsoid of revolution
n 1: a shape that is generated by rotating an ellipse around one
of its axes; "it looked like a sphere but on closer
examination I saw it was really a spheroid" [syn:
spheroid, ellipsoid of revolution]