| Quadratsekunde | second |
| Quadratestadt | City of Squares |
| Quadratmeile | square mile |
| Quadratschädel | square head block |
| Quadratfuß | square foot |
| Quadrupede | quadruped |
| Quadratmeter | square meter square metre |
| Quadratum | quadrate bone |
| Quadratur | quadrature |
| Quadratwurzel | square root |
| Lichtsekunde | light-second |
| Schaltsekunde | leap second |
| Amperesekunde | coulomb |
| Mikrosekunde | microsecond |
| Nanosekunde | nanosecond |
| Rassenkunde | study of race |
| Quadrieren | quadrature |
| quadrieren | square |
| Quadrilliarde | octillion |
| Quadriplegie | quadriplegia |