Meaning of the Sanskrit Word: samadhau

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

Can't find any compound Sanskrit words containing samadhau.