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 incident    SB 7.13.11
  itihasam—historical narration    SB 6.2.47, SB 6.2.48, SB 6.2.47-48

Can't find any compound Sanskrit words containing itihasam.