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Webster 1913 Edition

Ellipsoid

El-lip′soid

,
Noun.
[
Ellipse
+
-oid
: cf. F.
ellipsoide
.]
(Geom.)
A solid, all plane sections of which are ellipses or circles. See
Conoid
,
Noun.
, 2
(a)
.
☞ 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.

Webster 1828 Edition

Ellipsoid

ELLIPS'OID

,
Noun.
[ellipsis and Gr. form.] In conics, a solid or figure formed by the revolution of an ellipse about its axis; an elliptic conoid; a spheroid.

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