Meaning of the Sanskrit Word: midhvamsam

  midhvamsam—unto Lord Siva    SB 4.7.16
  midhvamsam—Lord Siva    SB 4.7.7
  midhvamsam—expert in discharging semen    SB 9.19.5, SB 9.19.6, SB 9.19.5-6

Can't find any compound Sanskrit words containing midhvamsam.