Definition of "lis"

lis¹

noun
plural lisses
1. (heraldic) Fleur-de-lis.
  Quotations
  […] it may be dimidiated: for instance, half a rose and half a lis being stuck together, or half a lis and half an eagle.
  1915, Guy Cadogan Rothery, ABC of Heraldry, page 175

lis²

noun
1. plural of li

lis³

noun
1. (law) The substance of a legal dispute.