Meaning of the Sanskrit Word: visnau

  visnau—unto the Supreme Personality of Godhead, Visnu    Madhya 9.259-260
  visnau—unto Lord Visnu (not to anyone else)    SB 7.5.23, SB 7.5.24, SB 7.5.23-24
  visnau—in Lord Visnu, or Krsna    Madhya 23.8

Can't find any compound Sanskrit words containing visnau.