Crossword clues for the word: RERUM The word RERUM has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for RERUM Showing 1 to 5 of 5 results Clue(s) ___ novarum ___ primordia (first beginnings of things): Lat. ___ primordia (first beginnings of things). """De ___ Natura,"" Lucretian opus" In ___ natura (in the nature of things): Lat.