| Quadratmeile | square mile |
| Quadratmeter | square meter square metre |
| Quadratzahl | square number |
| Quadratfuß | square foot |
| Quadriplegie | quadriplegia |
| Quadrupede | quadruped |
| Quartil | quartile |
| Quaderstein | ashlar square stone |
| Quadragesima | Lent |
| Quadrat- | square |
| Quadrat | square |
| Quadratsekunde | second |
| Quadratum | quadrate bone |
| Quadratur | quadrature |
| Quadratwurzel | square root |
| Quadrille | quadrille |
| Quadrofonie | quadraphonic sound |
| quadratisch | quadratic square |
| Bartmeise | bearded tit |
| Quadrieren | quadrature |
| quadrieren | square |