Meaning of the Sanskrit Word: vaktrena

  vaktrena—by the mouth    SB 6.9.13, SB 6.9.14, SB 6.9.15, SB 6.9.16, SB 6.9.17, SB 6.9.13-17
  vaktrena—with his mouth    SB 6.12.27, SB 6.12.28, SB 6.12.29, SB 6.12.27-29

Can't find any compound Sanskrit words containing vaktrena.