Meaning of the Sanskrit Word: abhavasya

  abhavasya—of whom there is no birth, death or maintenance as for an ordinary being    SB 10.2.39
  abhavasya—transcendental to material existence    SB 3.28.23
  abhavasya—of the unborn    SB 5.6.15
  abhavasya—of one who is never born    SB 3.4.16

Can't find any compound Sanskrit words containing abhavasya.