rishon

noun1

1. •
   A hypothetical fundamental particle in an early preon model.

noun1

1. •
   (historical) A rabbi in the era preceding the publication of the Shulchan Aruch, from 1038 to 1563 CE.

   • Since the days of the Rishonim, the version appearing in our Haggadot is the one accepted by all Jewry. — 1996