oblique circular cone

American

noun

Geometry.

a cone whose surface is generated by lines joining a fixed point to the points of a circle, the fixed point lying on a line that is not perpendicular to the circle at its center.

Probably earlier than 1950–55

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023