| A | B |
|---|
| quadrangle | a four-sided enclosure, usually surrounded by buildings |
| quadrant | one out of four equal parts of a circle; one section of a four-section coordinate grid |
| 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 figure in geometry that has four sides (including square, rectangle, rhombus, parallelogram, and 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 or as many of something |
| quadruplet | a collection or group of four; one of four babies born from the same mother at the same time |
| triangle | a three-sided figure |
| triathlon | a race that combines three activities--swimming, bicycling, and running |
| triceratops | a dinosaur with three horns--two long horns above the ears and one short horn on the nose |
| tricycle | a vehicle with three wheels |
| trilateral | having or involving three sides, countries, or parties |
| trilingual | able to speak three different languages |
| trilogy | three related plays or novels |
| trio | a group of three people or things |
| tripod | a three-legged stool, table, or stand used to hold things, such as a camera |
| trisect | to cut into three parts |
