Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
anything that scrubs or is used for scrubbing: specif., an apparatus that cleans the gases passing through a smokestack of a coal-burning power plant
Origin: scrub plush -er
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
One that scrubs, especially:
a. One who cleans floors, for example, by scrubbing.
b. A brush, appliance, or abrasive that is used in cleaning.
c. An apparatus that is used for removing impurities from a gas.