noun[ C ]mathematicsspecializeduk/ˈkwɒd.rɪk/us/ˈkwɑː.drɪk/
二次曲面;二次曲线
a curve or surface that is described by an equation (= a mathematical statement in which you show that two amounts are equal) that has at least one variable (= a number that can change) that is squared(= multiplied by itself)