vacuist
vacuist
(ˈvækjʊɪst)n
(General Physics) a person who believes in the existence of vacuums between molecules and atoms of matter or between bodies of the universe
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014