Meaning of the Sanskrit Word: vasiyachena

  vasiyāchena—was sitting    Adi 5.218-219, Adi 16.28, Antya 6.44
  vasiyāchena—there were sitting    Adi 7.58
  vasiyāchena—is sitting    Madhya 10.166
  vasiyāchena—sat    Madhya 12.188

Can't find any compound Sanskrit words containing vasiyachena.