Meaning of the Sanskrit Word: gurau

  gurau—to the spiritual master    SB 5.5.10-13, SB 7.12.15
  gurau—unto the spiritual master.    SB 6.7.1, SB 7.12.1, SB 7.15.25, SB 7.15.26, SB 8.16.28
  gurau—unto the superior    SB 3.13.10
  gurau—unto the Supreme Lord or His representative    SB 4.29.36-37

Can't find any compound Sanskrit words containing gurau.