Source : Webster's Revised Unabridged Dictionary (1913)

   2. (Chem.) Incapable of being together without mutual
      reaction or decomposition, as certain medicines.

   {Incompatible terms} (Logic), terms which can not be combined
      in thought.

   Syn: Inconsistent; incongruous; dissimilar; irreconcilable;
        unsuitable; disagreeing; inharmonious; discordant;
        repugnant; contradictory. See {Inconsistent}.