el·lip·soi·dal

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

Origin:
1825–35; ellipsoid + -al1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
ellipsoid (ɪˈlɪpsɔɪd) [Click for IPA pronunciation guide]
 
n
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
 
ellipsoidal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Ellipsoidal is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a gadget; dingus; thingumbob.
Example sentences
At maturity, beaked, ellipsoidal capsules fill with minute seeds.
It was elongated during the spreading of the graben and evolved from a circular
  to an ellipsoidal form.
Ellipsoidal height is the sum of elevation and geoid height.
Accuracy of ellipsoidal heights determined by these observations vary, and are
  sometimes less than third-order.
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