Ellipsoid

[ih-lip-soid] /ɪˈlɪp sɔɪd/

noun
1.
Geometry. a solid figure all plane sections of which are ellipses or circles. Typical equation: (x 2 / a 2) + (y 2 / b 2) + (z 2 / c 2) = 1.
adjective
2.
.
/ɪˈlɪpsɔɪd/
noun
1.

1721; see ellipse + -oid. From 1861 as an adjective (earlier adjective was ellipsoidal).
ellipsoid
(ĭ-lĭp’soid’)
A three-dimensional geometric figure resembling a flattened sphere. Any cross section of an ellipsoid is an ellipse or circle. An ellipsoid is generated by rotating an ellipse around one of its axes.

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