scrubber

A scrubber is usually something used to clean by rubbing hard, like a rough sponge, a scouring pad, or a stiff brush. It can also mean a machine that cleans something by removing unwanted material. In industry, a scrubber removes pollutants from waste gases before they are released into the air. In technology, a data scrubber is a program that cleans messy or inconsistent data. The word can also refer to a person who scrubs, but in some regions it has been used as an insult, so it should be used carefully.

The word "scrubber" has several meanings, but they all center on cleaning by rubbing hard or by taking unwanted material away. Most often, it means a rough cleaning tool, such as a scouring pad for pots, a stiff brush, or a powered machine used to clean large floors. For example: "She grabbed a heavy-duty scrubber to tackle the baked-on grime in the oven."

Outside the home, "scrubber" also has important technical uses. In environmental engineering, a scrubber is a system that removes harmful chemicals, dust, or smoke particles from industrial emissions. In computing, a data scrubber is software that finds and fixes errors, duplicates, or inconsistencies in a database or dataset.

The word also has a human meaning. It can literally describe someone whose job is to scrub or clean, but in British and Australian slang it has also been used as a rude or insulting term. There is also an older maritime sense: sailors scrubbed wooden decks with stones called "holystones." Whether it refers to a hand tool, a large machine, software, or sometimes a person, "scrubber" usually points to something that cleans by rubbing, filtering, or removing what should not be there.