An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Of or relating to or resembling a → square.
Of, relating to, or containing terms with powers no higher than the power of two.

Quadratic, adj. of quadrate, from L. quadratus p.p. of quadrare "to make square."

Câruši pertaining to câruš "square," from Av. caθruša- "four sides (of a four-sided figure)," from caθru- "four," Mod.Pers. cahâr, câr "four," cognate with L. quattuor, → four.

An equation with the general form of ax² + bx +c = 0, in which the highest power of the unknown is the second power (square).

→ quadratic; → equation.

A formula relating the unknown part of a → quadratic equation (the roots of the equation, x) to the known parts (a, b, and c): x = (-b± (b² - 4ac)^½) / 2a.

→ quadratic; → formula.