1. Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934); [syn: Sitter, Willem de Sitter]
WordNet (r) 3.0 (2006):
Willem de Sitter
n 1: Dutch astronomer who calculated the size of the universe
and suggested that it is expanding (1872-1934) [syn:
Sitter, Willem de Sitter]