Meaning of the Sanskrit Word: sadho

  sadho—O great, saintly person    SB 5.10.18, SB 7.10.18, SB 8.16.17
  sadho—O sage    SB 1.1.11
  sadho—O honest one    SB 3.4.12
  sadho—O good one    SB 3.5.18
  sadho—O Vidura    SB 3.19.9
  sadho—the great saint    SB 9.16.15

Can't find any compound Sanskrit words containing sadho.