Meaning of the Sanskrit Word: pulkasah

  pulkaśāḥ—Pulkaśas    Madhya 24.179, Madhya 24.209
  pulkaśāḥ—another province    SB 2.4.18
  pulkasaḥ—a caṇḍāla    SB 9.21.10

Can't find any compound Sanskrit words containing pulkasah.