appurtenance - a supplementary component that improves capabilityconstituent, element, component - an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system" computer accessory - an accessory for a computer; "when you add in all the computer accessories you are going to need the computer gets pretty expensive" fitting - a small and often standardized accessory to a larger system trimmings, fixings - the accessories that normally accompany (something or some activity); "an elaborate formal dinner with all the fixings"; "he bought a Christmas tree and trimmings to decorate it" |