Search Result for "vacuist": 
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perl: warning: Falling back to the standard locale ("C").
1 definitions retrieved:

The Collaborative International Dictionary of English v.0.48:

Vacuist \Vac"u*ist\, n. [Cf. F. vacuiste.] 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. [1913 Webster]