Meaning of the Sanskrit Word: rajasu

  räjasu—the governing personalities    SB 1.3.25
  räjasu—unto the kings    SB 1.8.37
  räjasu—upon the kings of that type    SB 2.7.20
  räjasu—among the kings headed by Jaräsandha    Adi 6.73

Can't find any compound Sanskrit words containing rajasu.