Vacuist

• (n.) One who holds the doctrine that the space between the bodies of the universe, or the molecules and atoms of matter., is a vacuum; -- opposed to plenist.
Found on http://thinkexist.com/dictionary/meaning/vacuist/

vacuist

vacuist One who holds the doctrine that the space between the bodies of the universe, or the molecules and atoms of matter, is a vacuum; opposed to plenist.
Found on http://www.wordinfo.info/words/index/info/view_unit/2258/2

vacuist

one who holds that an absolute vacuum is possible in nature
Found on http://phrontistery.info/v.html
No exact match found