nucleal

from The Collaborative International Dictionary of English v.0.48

Nucleal \Nu"cle*al\, Nuclear \Nu"cle*ar\, a.
   1. Of or pertaining to a nucleus; as, the nuclear spindle
      (see Illust. of {Karyokinesis}) or the nuclear fibrils of
      a cell; the nuclear part of a comet, etc.
      [1913 Webster]