Meaning of the Sanskrit Word: nisnatah

  niṣṇātaḥ—well versed    SB 1.4.21
  niṣṇātaḥ—fully realized    SB 2.4.10
  niṣṇātaḥ—being merged in    SB 4.24.9
  niṣṇātaḥ—very experienced    SB 5.24.24

Can't find any compound Sanskrit words containing nisnatah.