| synchroon | in sync |
| synchroonzwemmen | synchronised swimming |
| Synchroonzwemmen op de Olympische Zomerspelen | Synchronized swimming at the Summer Olympics |
| Synchrotronstraling | Synchrotron radiation |
| syncope | syncope |
| syncoperen | syncopate |
| Syndactylie | Dactyly |
| syndicaat | syndicate |
| syndicalisme | syndicalism |
| syndroom | syndrome |
| Syndroom van Adie | Adie syndrome |
| Syndroom van Alagille | Alagille syndrome |
| Syndroom van Alport | Alport syndrome |
| Syndroom van Angelman | Angelman syndrome |
| Syndroom van Apert | Apert syndrome |
| Syndroom van Asperger | Asperger syndrome |
| Syndroom van Barth | Barth syndrome |
| Syndroom van Bloom | Bloom syndrome |
| Syndroom van Capgras | Capgras delusion |
| Syndroom van Charles Bonnet | Charles Bonnet syndrome |
| Syndroom van Churg-Strauss | Churg-Strauss syndrome |
| Syndroom van Conn | Conn syndrome |
| Syndroom van Cornelia de Lange | Cornelia de Lange Syndrome |
| Syndroom van Cotard | Cotard delusion |
| Syndroom van Crouzon | Crouzon syndrome |
| syndroom van Down | Down's syndrome |
| Syndroom van Edwards | Edwards syndrome |
| Syndroom van Ehlers-Danlos | Ehlers-Danlos syndrome |
| Syndroom van Fitz-Hugh-Curtis | Fitz-Hugh-Curtis syndrome |
| Syndroom van Ganser | Ganser syndrome |
| Syndroom van Gerstmann | Gerstmann syndrome |
| syndroom van Gilles de la Tourette | Tourette syndrome |
| syndroom van Guillain-Barré | Guillain-Barré syndrome |
| Syndroom van inadequate secretie van antidiuretisch hormoon | Syndrome of inappropriate antidiuretic hormone |
| Syndroom van Kallmann | Kallmann syndrome |
| Syndroom van Klippel-Trenaunay | Klippel-Trenaunay-Weber syndrome |
| Syndroom van Klüver-Bucy | Klüver-Bucy syndrome |
| Syndroom van Laurence-Moon-Bardet-Biedl | Bardet-Biedl syndrome |
| Syndroom van Marfan | Marfan syndrome |
| Syndroom van Mayer-Rokitansky-Küster | Mullerian agenesis |
| Syndroom van Moebius | Mobius syndrome |
| Syndroom van Noonan | Noonan syndrome |
| Syndroom van Patau | Patau syndrome |
| Syndroom van Peutz-Jeghers | Peutz-Jeghers syndrome |
| Syndroom van Pfeiffer | Pfeiffer syndrome |
| Syndroom van Prader-Willi | Prader-Willi syndrome |
| Syndroom van Ramsay Hunt | Ramsay Hunt syndrome type II |
| Syndroom van Reiter | Reactive arthritis |
| Syndroom van Rett | Rett syndrome |
| Syndroom van Sotos | Sotos syndrome |
| Syndroom van Sturge-Weber | Sturge-Weber syndrome |
| Syndroom van Turner | Turner syndrome |
| Syndroom van Usher | Usher syndrome |
| Syndroom van Waardenburg | Waardenburg syndrome |
| Syndroom van Wallenberg | Lateral medullary syndrome |
| Syndroom van Wernicke | Wernicke-Korsakoff syndrome |
| synecdoche | synecdoche |
| Synedrion | Synedrion |
| synergie | synergy |
| Synesius van Cyrene | Synesius |
| Syngman Rhee | Syngman Rhee |
| synode | synod |
| Synode van Clermont | Council of Clermont |
| Synode van Dordrecht | Synod of Dort |
| Synode van Elvira | Synod of Elvira |
| Synode van Whitby | Synod of Whitby |
| synoniem | synonymous |
| synoniemenboek | thesaurus |
| synopsis | summary |
| Synoptische tabel van de voornaamste prehistorische culturen van de Oude Wereld | Synoptic table of the principal old world prehistoric cultures |
| syntactisch | syntactic |
| syntaxis | syntax |
| synthese | synthesis |
| synthesizer | synthesizer |
