conical surface
union of all the straight lines that pass through a fixed point and intersect a fixed space curve
en-GB/ˈkɒnɪkl ˈsɜːfɪs/
en-US/ˈkoʊnɪkəl ˈsɝfɪs/
union of all the straight lines that pass through a fixed point and intersect a fixed space curve