Meaning of the Sanskrit Word: caksumsi

  cakṣūṁṣi—the eyes    SB 6.8.26
  cakṣūṁṣi—your eyes    SB 8.7.27
  cakṣūṁṣi—the power of vision    SB 10.7.21

Can't find any compound Sanskrit words containing caksumsi.