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quadrangle
a four-sided enclosure, usually surrounded by bulidings
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quadrant
one out of four equal parts of a circle; one section of a four-section coordinate grid
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quadrennial
happening every four years
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quadriceps
a muscle group consisting of four muscles located along the front of the thigh
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quadrilateral
a plane figure in geometry that has four sides
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quadrilingual
the ability to speak four languages
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quadrisect
to cut or divide into four equal parts
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quadruped
an animal with four feet
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quadruple
to create four times as much or as many of something
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quadruplet
a collection or group of four; one of four babies born from the same mother at the same time.