Meaning of the Sanskrit Word: samadhau

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

Can't find any compound Sanskrit words containing samadhau.