Meaning of the Sanskrit Word: vaitaranyam

  vaitaranyam—in the river known as Vaitarani (which lies in front of the doorway of Yamaraja, the superintendant of death)    SB 7.9.41
  vaitaranyam—named Vaitarani    SB 5.26.22
  vaitaranyam—in Vaitarani, the river of suffering    SB 2.2.7

Can't find any compound Sanskrit words containing vaitaranyam.