| Noun | 1. | plumbing system - utility consisting of the pipes and fixtures for the distribution of water or gas in a building and for the disposal of sewageplumbing fixture - a fixture for the distribution and use of water in a building utility - a facility composed of one or more pieces of equipment connected to or part of a structure and designed to provide a service such as heat or electricity or water or sewage disposal; "the price of the house included all utilities" |