Source : Webster's Revised Unabridged Dictionary (1913)

Accessory \Ac*ces"so*ry\, n.; pl. {Accessories}.
   1. That which belongs to something else deemed the principal;
      something additional and subordinate. ``The aspect and
      accessories of a den of banditti.'' --Carlyle.

   2. (Law) Same as {Accessary}, n.

   3. (Fine Arts) Anything that enters into a work of art
      without being indispensably necessary, as mere ornamental
      parts. --Elmes.

   Syn: Abettor; accomplice; ally; coadjutor. See {Abettor}.