| A | B |
|---|
| quadrangle | A four-sided area surrounded on all sides by buildings. |
| quadrant | one of four equal parts of a circle; one section of a four-section coordinate grid (graph) |
| quadrennial | happening every four years |
| quadriceps | a muscle group consisting of four muscles that is located along the front of the thigh |
| quadrilateral | A plane sided figure in geometry that has for sides such as square, rectangle, rhombus, parallelogram, trapezoid. |
| quadrilingual | the ability to speak four languages |
| quadrisect | to cut or divide into four equal parts |
| quadruped | an animal with four feet. |
| quadruple | to create four times as much of something. |
| quadruplet | a collection or group of four; one of four babies born from the same mother as the same time |
| quadrans | Fourth of a penny; a farthing or fourth part of the ancient roman coin called an As. |
| quadriga | A car or chariot drawn by four horses abreast |
| quadrillion | (in the US and Canada) the number represented as one followed by 15 zeros (1015) but in Great Britain the number represented as one followed by 24 zeros (1024) this would be the same as the US and Canadian word septillion. |
| quadrivalent | Having a valence of four; capable of combining with, being replaced by, or compared with, four atoms also called tetravalent |
