Meaning of the Sanskrit Word: yajnasya

  yajñasya—of sacrifices    SB 3.7.30, SB 8.8.2
  yajñasya—of the sacrificial performance    SB 2.6.24
  yajñasya—of Lord Boar    SB 3.22.29-30

Can't find any compound Sanskrit words containing yajnasya.