1.   Quadr, Quar – four   
1. Quarterly (n.) a magazine published once every quarter (3 months)
When the magazine Gentleman’s Quarterly was started in 1931 it was published once every quarter or every three months;  now it is published monthly and is known as GQ.
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2.   Quadr, Quar – four   
2. quadruped (n.) an animal with four feet
Elephants, lions, cows, sheep and pigs are quadrupeds whereas chickens and ducks have two feet.
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3.   Quadr, Quar – four   
3. quadrilateral (n.)   a geometric figure with four sides
Squares, rectangles, parallelograms and rhombuses are all examples of quadrilaterals.  What do they have in common? 
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4.   Quadr, Quar – four   
4. quadricentennial (n.): a 400th (4th century) anniversary date
The U.S. will celebrate the quadricentennial of the signing of the Declaration of Independence on July 4, 2176.
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