plenist

/ˈpliːnɪst/
noun
  1. A person who believes in plenism, the theory that all space is filled with matter.
    • Modern physicists are not plenists, as they accept the existence of vacuums.
    • The plenist argued that nature abhors a vacuum.
    • Descartes was a famous plenist who rejected the idea of empty space.
Antonyms
What does "plenist" mean? | whatsthatwordmean | whatsthatwordmean