Source : Webster's Revised Unabridged Dictionary (1913)

Appendage \Ap*pend"age\, n.
   1. Something appended to, or accompanying, a principal or
      greater thing, though not necessary to it, as a portico to
      a house.

            Modesty is the appendage of sobriety. --Jer. Taylor.

   2. (Biol.) A subordinate or subsidiary part or organ; an
      external organ or limb, esp. of the articulates.

            Antenn[ae] and other appendages used for feeling.
                                                  --Carpenter.

   Syn: Addition; adjunct; concomitant.

Source : WordNet®

appendage
     n 1: an external body part that projects from the body; "it is
          important to keep the extremities warm" [syn: {extremity},
           {member}]
     2: a natural prolongation or projection from a part of an
        organism either animal or plant; "a bony process" [syn: {process},
         {outgrowth}]
     3: a part that is joined to something larger