Type: Term Pronunciation: vyū-sŏn[h]′ Definitions: 1. Raymond de, French anatomist, 1641-1715. See: Vieussens anulus, Vieussens ansa, Vieussens centrum, Vieussens foramina, under foramen, Vieussens ganglia, under ganglion, Vieussens isthmus, Vieussens limbus, Vieussens loop, Vieussens ring, valve of Vieussens, Vieussens valve, Vieus...