Meaning of the Sanskrit Word: samadhau

  samadhau—in the controlled mind    Bg 2.44
  samadhau—in trance    SB 10.1.21
  samadhau—in transcendental consciousness, or Krsna consciousness    Bg 2.53
  samadhau—into trance.    SB 4.12.17

Can't find any compound Sanskrit words containing samadhau.