What is the meaning of Extremus?

superlative degree of exter

1. farthest, outermost, extreme
2. coming at the end, last, final, ultimate

   farthest, outermost, extreme

   coming at the end, last, final, ultimate

   extreme in degree, intense

   the end, edge or tip of something:

   1. rear

      end

      Source: wiktionary.org