Meaning of the Sanskrit Word: nirrtih

  nirrtih—Nirrti    SB 4.8.2, SB 4.29.14, SB 6.3.14-15
  nirrtih—death    SB 1.19.4
  nirrtih—low activities    SB 3.12.26
  nirrtih—of the name Nirrti    SB 4.25.53

Can't find any compound Sanskrit words containing nirrtih.