Meaning of the Sanskrit Word: midhvamsam

  mīḍhvāṁsam—Lord Śiva    SB 4.7.7
  mīḍhvāṁsam—unto Lord Śiva    SB 4.7.16
  mīḍhvāṁsam—expert in discharging semen    SB 9.19.5-6

Can't find any compound Sanskrit words containing midhvamsam.