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a subordinate part attached to something; an auxiliary part; addition.
Anatomy, Zoology. any member of the body diverging from the axial trunk.
Botany, Mycology. any subsidiary part superadded to another part.
a person in a subordinate or dependent position, especially a servile or parasitic follower.
Contemporary Examples

Or, one of the measures might resurface as an appendage to an unrelated law.
Why Arizona is Retreating on its Immigration Law Terry Greene Sterling March 18, 2011

So many were arrested in Leningrad, the poet Anna Akhmatova said, that the city “dangled like an appendage from its prisons….”
When Stalin Met Lady Macbeth Brian Moynahan November 8, 2014

Bloggers brought another microphone to an already crowded GOP media table and became an appendage of talk radio.
Why the GOP Lost the Web Race Eric Boehlert May 19, 2009

Historical Examples

The broad thin “appendage” figured may have been a fragment of a thoracic segment.
The Appendages, Anatomy, and Relationships of Trilobites Percy Edward Raymond

The subject is a great one and cannot be adequately treated as an appendage to another.
Timaeus Plato

Under these conditions, one end of the appendage harmonizes with the lantern and the other end with the wall.
Industrial Arts Design William H. Varnum

This appendage, there can be no doubt, originated with the basilicas of Italy.
Architecture Thomas Roger Smith

A recurving ridge, however, which has an appendage connected with it in the line of flow cannot be construed as a circuit.
The Science of Fingerprints Federal Bureau of Investigation

Did it ever occur to you that it must be disagreeable to Watch to have such an appendage to his tail?
Paul Prescott’s Charge Horatio Alger

This appendage is often found to measure eighteen inches in length!
The Hunters’ Feast Mayne Reid

noun
an ancillary or secondary part attached to a main part; adjunct
(zoology) any organ that projects from the trunk of animals such as arthropods
(botany) any subsidiary part of a plant, such as a branch or leaf
n.

1640s, from append + -age.

appendage ap·pend·age (ə-pěn’dĭj)
n.
A part or organ attached to a main structure and subordinate in function or size.