ellipticity
NounSynonyms:
oblateness
Open English WordNet
Noun (1)
- the property possessed by a round shape that is flattened at the poles“the oblateness of the planet”Synonyms: oblatenessType of roundedness, bulginess
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ephemeraladjective
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Webster's Dictionary (1913)
El′lip·tic′i·ty noun
Origin: Cf. F. ellipticité.
Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, divided by the equatorial; thus, the ellipticity of the earth is 1⁄29966.
☞ Some writers use ellipticity as the ratio of the difference of the two semiaxes to the minor axis, instead of the major. John Pringle Nichol
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54