in rerum natura
adverb
in re·rum na·tu·ra
\-ˈrārəmnəˈtu̇rə, -ˈrēr-\
Definition of in rerum natura
: in the nature of things in the world of nature as distinguished from the world of human beings : in the realm of material things they do not signify anything in rerum natura — R. F. McRae
From the M-W Editors
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Origin and Etymology of in rerum natura
Latin
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