| Zyklostome | cyclostome |
| Zytostom | cytostome |
| Zäkostomie | caecostomy cecostomy |
| Zökostomie | caecostomy cecostomy |
| Zykloide | cycloid |
| Zyklone | cyclone |
| Zyklotron | cyclotron |
| Zäkotomie | cecotomy typhlotomy |
| Zökotomie | cecotomy typhlotomy |
| Zyklon | cyclone |
| Zyklop | cyclops |
| Zykloplegie | cycloplegia |
| Zyklus | cycle |
| zyklisch | cyclic |
| Kloster | monastery convent |
| Myelose | myelosis |
| Xylose | xylose wood sugar |
| Hypostase | hypostase |
| Kostüm | suit costume fancy dress |
| Xerostomie | xerostomia |