Meaning of the Sanskrit Word: prsthatah

  pṛṣṭhataḥ—from the back    SB 3.12.25, SB 4.29.54, SB 6.11.4, SB 8.5.40
  pṛṣṭhataḥ—from behind    Bg 11.40
  pṛṣṭhataḥ—behind    SB 3.4.5
  pṛṣṭhataḥ—on His back    SB 8.7.10
  pṛṣṭhataḥ—to the back    SB 9.5.17

Can't find any compound Sanskrit words containing prsthatah.