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spheroconic
spheroconic adj. 
/ˌsfɛroʊˈkɑnɪk/ Mathematics, (see quots.).
Brit. /ˌsfɪərə(ʊ)ˈkɒnɪk/
, /ˌsfɪərə(ʊ)ˈkɒnɪk/U.S. /ˌsfɪroʊˈkɑnɪk/
, /ˌsfɪroʊˈkɑnɪk//ˌsfɛroʊˈkɑnɪk/ΚΠ
1867 W. T. Brande & G. W. Cox Dict. Sci., Lit. & Art (new ed.) III. 532/1 Sphero-conic, the section of a sphere by a quadric cone having its vertex at the centre.
1871 Casey in Philos. Trans. (Royal Soc.) 161 585 A sphero-quartic is the envelope of a variable circle whose centre moves along the sphero-conic, and which cuts the circle J orthogonally.
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