Meaning of the Sanskrit Word: istim

  istim—a sacrifice    SB 9.1.13, SB 9.23.7, SB 9.23.8, SB 9.23.9, SB 9.23.10, SB 9.23.7-10
  istim—a ritualistic ceremony    SB 9.6.26
  istim—goal    SB 1.15.39

Can't find any compound Sanskrit words containing istim.