Tripuri poornima or Tripurari Poornima derives its name from Tripurari - the foe of the demon Tripurasura.
In some legends related to Kartik Poornima, the term is used to denote the three demon sons of Tarakasura.
Tripurari is an epithet of god Shiva. Shiva in his form as Tripurantaka ("Killer of Tripurasura") killed Tripurasura on this day.
