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.

Antennæ and other appendages used for feeling.
Carpenter.

Syn. -- Addition; adjunct; concomitant.