| systemoid | systemoid |
| System | system structure |
| Systematik | systematics |
| systemlos | systemless unmethodical without a system |
| Asteroid | asteroid |
| Steroid | steroid |
| Systole | systole |
| systemisch | systemic |
| Cystein | cysteine |
| Hysterie | hysteria hysterics |
| Ostermond | April |
| Erntemond | harvest moon |
| SysOp | sysop |
| Sysop | sysop |
| Systemtheorie | system theory |
| systematisch | systematic systematical |
| Cystin | cystine |
| Ecdysteroide | ecdysteroid |
| Hysterese | hysteresis |
| Dysthymie | dysthymia |