the.com/appendage
A part that hangs around, technically optional, biologically committed.
means A projecting or attached body part, like a limb or tail, or anything tacked onto a larger whole.
from From Latin appendere, to hang upon, sharing roots with append and pendant — all about things dangling from something bigger.
Legal useMeans an added clause or attachment to documents.
StarfishTheir arms are appendages that regrow when lost.
Insect countArthropods are literally named for jointed appendages.