Meaning of the Sanskrit Word: prsthatah

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

Can't find any compound Sanskrit words containing prsthatah.