The Collaborative International Dictionary of English v.0.48:

Inorganic \In`or*gan"ic\, a. [Pref. in- not + organic: cf. F.
   inorganique.]
   1. Not organic; without the organs necessary for life; devoid
      of an organized structure; unorganized; lifeness;
      inanimate.
      [1913 Webster]

   2. (Chem.) Of or pertaining to compounds that are not
      derivatives of hydrocarbons; not organic[5].
      [PJC]

   Note: The term inorganic is used to denote any one the large
         series of substances (as minerals, metals, etc.), which
         are not directly connected with vital processes, either
         in origin or nature, and which are broadly and
         relatively contrasted with organic substances. See
         Organic[5].
         [1913 Webster]

   Inorganic Chemistry. See under Chemistry.
      [1913 Webster]

WordNet (r) 3.0 (2006):

inorganic
    adj 1: relating or belonging to the class of compounds not
           having a carbon basis; "hydrochloric and sulfuric acids
           are called inorganic substances" [ant: organic]
    2: lacking the properties characteristic of living organisms
       [ant: organic]