What is defined as installed receptacles, devices, or appliances that handle liquids or liquid-borne waste?

The term that refers to installed receptacles, devices, or appliances that handle liquids or liquid-borne waste is fixtures. In plumbing terminology, fixtures serve as the connection points where water or waste is delivered, utilized, or removed. This includes sinks, toilets, bathtubs, and other similar components that play a critical role in a drainage system by allowing for the convenient handling of liquids.

Understanding this definition is important because fixtures are essential for ensuring proper sanitation and functionality within plumbing systems. They are specifically designed to manage and facilitate the flow and disposal of liquid waste safely and efficiently. The other options, while related to plumbing systems, have different meanings. For instance, drainage systems refer to the network of pipes that remove waste, traps are devices that prevent sewer gases from entering a building, and appurtenances are accessory structures or components that serve a related function but are not the primary receptacles themselves. Therefore, fixtures directly align with the definitions and roles associated with handling liquid or liquid-borne waste.