(n)  a four-sided shape or rectangular

 courtyard

• quadrangle

• quadrant

• quadruped

• quadriceps

(n)  one part of something cut into four

equal parts

• quadruped

• quadriceps

• quadrennial

• quadrant

(adj)  occurring every four years

• quadrennial

• quadruplet

• quadrant

• quadreped

(n)  muscle group consisting of four muscles

 that is located along the front of the thigh

• quadrangle

• quadriceps

• quadresect

• quadrilateral

(n) any four sided figure

• quadruped

• quadruple

• quadruplet

• quadrilateral

(adj)  able to speak four languages

• quadrilingual

• quadrangle

• quadrant

• quadrennial

(v) to cut or divide into four equal parts

• quadruplet

• quadrisect

• quadruple

• quadrant

(n)  an animal having four feet

• quadrant

• quadriceps

• quadruped

• quadrennial

(v)  to multiply by four or increase four times

• quadrangle

• quadrilingual

• quadriceps

• quadruple

(n)  a collection or group of four; one of four

babies born from the same mother at the same time

• quadruplet

• quadrennial

• quadriceps

• quadrilateral