Meaning of the Sanskrit Word: rajamsi

  rajāṁsi—the atoms    SB 8.23.29, Madhya 24.21
  rajāṁsi—particles    SB 2.7.40
  rajāṁsi—particles of dust    SB 4.11.20
  rajāṁsi—atoms    Madhya 21.15

Can't find any compound Sanskrit words containing rajamsi.