| Zirkumflex | circumflex |
| Zirkumfix | circumfix |
| Zirkular | circular letter |
| zirkumpolar | circumpolar |
| Zirkulieren | circulation |
| zirkulieren | circulate |
| Zirmet | hartwort |
| zirkumbinär | circumbinary |
| Zirkel | compass pair of compasses circle |
| Zirkus | circus |
| Kurkume | turmeric |
| Herkules | Hercules hercules |
| visumfrei | visa-free |
| Reflex | reflex |
| Komplex | complex |
| komplex | complex |
| Simplex | simplex |
| Zirkumzision | circumcision |
| Zirpen | chirp |
| zirpen | chirp |