| syphilis | sifilide |
| syphilitic | sifilitico |
| syphon | sifone |
| Syphon Filter | Syphon Filter |
| Syr Darya | Syr Darya |
| Syracusa | Siracusa |
| Syracuse | Siracusa |
| Syrena | FSO Syrena |
| Syrgenstein | Syrgenstein |
| Syria | Siria |
| Syria national football team | Nazionale di calcio della Siria |
| Syriac | Lingua siriaca |
| Syriac Catholic Church | Chiesa siriaco-cattolica |
| Syriac language | Lingua siriaca |
| Syrian | siriano |
| Syrian Arab Republic | Siria |
| Syrian Brown Bear | Ursus arctos syriacus |
| Syrian Camel | Cammello gigante siriano |
| Syrian Hamster | Mesocricetus auratus |
| Syrian pound | Lira siriana |
| Syrian Revolution | Grande Rivoluzione Siriana |
| Syriana | Syriana |
| syringe | siringa |
| Syrmaticus | Syrmaticus |
| Syrmia | Sirmia |
| Syro-Malabar Catholic Archdiocese of Changanassery | Arcieparchia di Changanacherry |
| Syro-Malabar Catholic Archdiocese of Ernakulam-Angamaly | Arcidiocesi di Ernakulam-Angamaly |
| syrup | sciroppo di melassa |
| Syrup of ipecac | Sciroppo di ipecac |
| syrupy | sciropposo |
| Syslog | SysLog |
| Sysola River | Sysola |
| SysRq | R Sist |
| system | impianto |
| System console | Mensola |
| System integrator | System integrator |
| System Lord | Signori del sistema |
| System of a Down | System of a Down |
| System of a Down discography | Discografia dei System of a Down |
| System of law | Diritto |
| System of linear equations | Sistema di equazioni lineari |
| System Restore | Ripristino configurazione di sistema |
| System-on-a-chip | System-on-a-chip |
| Systema | Sistema |
| Systema Naturae | Systema Naturae |
| systematic | metodico |
| Systematic review | Review sistematica |
| Systematic theology | Teologia sistematica |
| systematically | sistematicamente |
| Systematics | Sistematica |
| systematize | sistemare |
| systemic | sistemico |
