quad·rat·ic
adjective/kwɒˈdrætɪk/
/kwɑːˈdrætɪk/
(mathematics)- involving an unknown quantity that is multiplied by itself once only
平方的；二次方的 - a quadratic equation
二次方程式
Oxford Collocations DictionaryQuadratic is used with these nouns:- equation
Word Originmid 17th cent.: from French quadratique or modern Latin quadraticus, from quadratus ‘made square’, past participle of quadrare, from quattuor ‘four’. - a quadratic equation