The word for today is…
plenist (noun):
: one who maintains that there are no vacuums in nature
Source : Collins
Etymology : A plenist is a follower of the philosophical theory of plenism that there are no vacuums in nature. It is often associated with the phrase "nature abhors a vacuum," attributed to Aristotle, although later criticised by atomistic theories. From the Latin plenus full, complete + English -ist
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