A plumber is a person whose job is to install and repair pipes, toilets, sinks, and other systems that carry water and waste in buildings. They help keep bathrooms, kitchens, and heating systems working properly.
From Old French *plommier* “worker in lead,” from Latin *plumbārius*, from *plumbum* “lead.” Pipes were once commonly made of lead, so the name stuck even after the materials changed.
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