Meaning of the Sanskrit Word: svaha

  svaha—hymns to perform sacrifices    SB 2.7.38
  svaha—Svaha, the wife of Agni    SB 4.1.60
  svaha—respectful oblations    SB 5.18.8
  svaha—hail    SB 6.19.8

Can't find any compound Sanskrit words containing svaha.