A three-dimensional shape formed by rotating an ellipse around one of its axes; also called a spheroid.
From ellipse combined with -oid meaning 'resembling or having the form of.' This mathematical term describes shapes intermediate between spheres and elongated forms.
Earth itself is an elliptoid—it's slightly flattened at the poles and bulging at the equator, which is why it's called an oblate spheroid rather than a perfect sphere.
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