[ih-lip-soid-l, el-ip-, ee-lip-]
pertaining to or having the form of an ellipsoid.

1825–35; ellipsoid + -al1

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World English Dictionary
ellipsoid (ɪˈlɪpsɔɪd)
a.  a geometric surface, symmetrical about the three coordinate axes, whose plane sections are ellipses or circles. Standard equation: x²/a² + y²/b² + z²/c² = 1, where ±a, ±b, ±c are the intercepts on the x-, y-, and z- axes
 b.  a solid having this shape: the earth is an ellipsoid

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Example sentences
It was elongated during the spreading of the graben and evolved from a circular
  to an ellipsoidal form.
The deflection of the vertical is the departure of a plumb bob's actual
  pointing from the ellipsoidal normal direction.
Ellipsoidal height is the sum of elevation and geoid height.
At maturity, beaked, ellipsoidal capsules fill with minute seeds.
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