appendage

noun3

1. •
   An external body part that projects from the body.

   • The insect has a pair of sensory appendages.
2. •
   A natural prolongation or projection from a part of any organism.

   • The small building was added as an appendage to the main structure.
3. •
   A part that is joined to something larger.

   • He disliked being treated as a mere appendage to the committee.