1. 
[syn: nuclear, atomic]
2.  of or relating to or constituting the nucleus of an atom; 
- Example: "nuclear physics"
- Example: "nuclear fission"
- Example: "nuclear forces"
3.  of or relating to or constituting the nucleus of a cell; 
- Example: "nuclear membrane"
- Example: "nuclear division"
4.  constituting or like a nucleus; 
- Example: "annexation of the suburban fringe by the nuclear metropolis"
- Example: "the nuclear core of the congregation"
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]
The Collaborative International Dictionary of English v.0.48:
Nuclear \Nu"cle*ar\, a.
   1. of, pertaining to, or using nuclear weapons; a nuclear
      exchange, i.e. a reciprocal bombardment by nuclear
      weapons..
      [PJC]
   2. Of, pertaining to, or powered by atomic energy; same as
      nuclear-powered; as, a nuclear submarine; a nuclear
      power plant.
      [PJC]
   3. Of or pertaining to nations possessing nuclear weapons;
      as, the nuclear club.
      [PJC]
WordNet (r) 3.0 (2006):
nuclear
    adj 1: (weapons) deriving destructive energy from the release of
           atomic energy; "nuclear war"; "nuclear weapons"; "atomic
           bombs" [syn: nuclear, 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"
Moby Thesaurus II by Grady Ward, 1.0:
42 Moby Thesaurus words for "nuclear":
   amidships, average, central, chromatinic, chromosomal, core,
   diploid, equatorial, equidistant, extranuclear, halfway, haploid,
   heteronuclear, homonuclear, interior, intermediary, intermediate,
   isonuclear, mean, medial, median, mediocre, mediterranean, medium,
   mesial, mezzo, mid, middle, middlemost, middling, midland, midmost,
   midships, midway, nucleal, nucleary, nucleate, nucleolar,
   nucleolate, nucleolated, polyploid, thermonuclear