Meaning of the Sanskrit Word: itihasam

  itihasam—history    SB 4.25.9, SB 6.3.35, SB 6.14.9, SB 6.17.40, SB 6.17.41, SB 7.2.27
  itihasam—the history (of Ajamila)    SB 6.1.20
  itihasam—historical narration    SB 6.2.47-48
  itihasam—historical incident    SB 7.13.11

Can't find any compound Sanskrit words containing itihasam.