quadrilateral

n, adj (plane figure) with four sides 四边形（的）.

QE2, QED, qr, qt, qto, qty, qua, quack, quack-quack, quackery, quad, quadr(i)-, Quadragesima, quadrangle, quadrangular, quadrant, quadraphonic (also quadrophonic), quadraphony (also quadrophony), quadratic equation, quadrennial, quadrille, quadrillion, quadrophonic, quadrophony, quadruped, quadruple, quadruplet, quadruplicate, quaff, quagmire, quail, quaint, quaintly, quaintness, quake, Quaker, qualification, qualified, qualifier, qualify, qualitative,