noun
: a second-degree surface possessing a center about which there is a symmetrical figure (as an ellipsoid, 1-sheeted or 2-sheeted hyperboloid, or cone)
noun
: a second-degree surface possessing a center about which there is a symmetrical figure (as an ellipsoid, 1-sheeted or 2-sheeted hyperboloid, or cone)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012