appendage in WordNet English dictionary

1. a part that is joined to something larger
   appendage 
   
2. an external body part that projects from the body
   "it is important to keep the extremities warm"
   extremity  appendage  member 
   
3. a natural prolongation or projection from a part of an organism either animal or plant
   "a bony process"
   process  outgrowth  appendage