The Collaborative International Dictionary of English v.0.48:

Odor \O"dor\ ([=o]"d[~e]r), n. [OE. odor, odour, OF. odor,
   odour, F. odeur, fr. L. odor; akin to olere to smell, Gr.
   'o`zein, Lith. [*u]sti. Cf. Olfactory, Osmium, Ozone,
   Redolent.] [Written also odour.]
   Any smell, whether fragrant or offensive; scent; perfume.
   [1913 Webster]

         Meseemed I smelt a garden of sweet flowers,
         That dainty odors from them threw around. --Spenser.
   [1913 Webster]

   To be in bad odor, to be out of favor, or in bad repute.
      [1913 Webster]

WordNet (r) 3.0 (2006):

odor
    n 1: any property detected by the olfactory system [syn:
         olfactory property, smell, aroma, odor, odour,
         scent]
    2: the sensation that results when olfactory receptors in the
       nose are stimulated by particular chemicals in gaseous form;
       "she loved the smell of roses" [syn: smell, odor,
       odour, olfactory sensation, olfactory perception]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "odor":
   air, aroma, atmosphere, attribute, aura, badge, balminess, bouquet,
   brand, breath, cachet, cast, character, characteristic,
   configuration, cut, differentia, differential, distinctive feature,
   earmark, feature, fetor, figure, flavor, fragrance, fragrancy,
   fruitiness, gust, hallmark, hint, idiocrasy, idiosyncrasy, impress,
   impression, incense, index, individualism, keynote, lineaments,
   mannerism, mark, marking, mold, muskiness, nature, nosegay,
   particularity, peculiarity, perfume, property, quality, quirk,
   redolence, savor, scent, seal, shape, singularity, smack, smell,
   specialty, spice, spiciness, spirit, stamp, stench, stink,
   suggestion, sweet savor, sweet smell, taint, tang, taste, token,
   tone, trait, trick