| Quadratur des Kreises | squaring the circle |
| quadratisches Mittel | root mean square |
| Quadratdezimeter | square decimetre |
| Quadratzentimeter | square centimeter |
| Quadratmeile | square mile |
| Quadratsekunde | second |
| quartalsweise | quarterly |
| unter dem Messer | under the knife |
| Gürtel des Orion | Orion's Belt |
| Freundeskreis | circle of friends |
| Quadratfuß | square foot |
| Quadratum oblongum | oblong |
| Quadrupeder | quadruped |
| Quartiermeister | quartermaster |
| quadratische Gleichung | quadratic equation |
| quadrupedisch | quadrupedally |
| Quadragesima | Lent |
| Quadratestadt | City of Squares |
| Quadratkilometer | square kilometre |
| Quadratmeter | square meter square metre |