Source : Webster's Revised Unabridged Dictionary (1913)

Nucleal \Nu"cle*al\, Nuclear \Nu"cle*ar\, a.
   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.

Source : WordNet®

nuclear
     adj 1: (weapons) deriving destructive energy from  the release of
            atomic energy; "nuclear war"; "nuclear weapons";
            "atomic bombs" [syn: {atomic}] [ant: {conventional}]
     2: of or relating to or constituting the nucleus of an atom;
        "nuclear physics"; "nuclear fission"; "nuclear forces"
     3: of or relating to or constituting the nucleus of a cell;
        "nuclear membrane"; "nuclear division"
     4: constituting or like a nucleus; "annexation of the suburban
        fringe by the nuclear metropolis"; "the nuclear core of
        the congregation"