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conical surface:see conecone
or conical surface,
in mathematics, surface generated by a moving line (the generator) that passes through a given fixed point (the vertex) and continually intersects a given fixed curve (the directrix).
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conical surface[′kän·ə·kəl ′sər·fəs]
A surface formed by the lines which pass through each of the points of a closed plane curve and a fixed point which is not in the plane of the curve.