. . . "a curve or surface whose equation (in Cartesian coordinates) is of the second degree"@en-us . "113902905"^^ . "a curve or surface whose equation (in Cartesian coordinates) is of the second degree"@en-us . . . "quadric"@en-us . "13902905-n"^^ . . "quadric surface"@en-us . . "0"^^ . . "113114890"@en-us . . "quadric"^^ . . "110018783"@en-us . "0"^^ .