| Quadratur | quadrature |
| Quadratum | quadrate bone |
| Quadrat- | square |
| Quadrat | square |
| Quadratfuß | square foot |
| Quadrant | quadrant |
| Quartär | Quaternary |
| Quart | quart |
| Quartil | quartile |
| Aquakultur | aquaculture |
| Quader | cuboid rectangular cuboid rectangular parallelepiped |
| Quadratmeter | square meter square metre |
| Quadratwurzel | square root |
| Quadratzahl | square number |
| Quadriga | quadriga |
| Quadrille | quadrille |
| Quadrivium | quadrivium |
| Quantor | quantifier |
| Quantum | quantum |
| Quartal | quarter |