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brown rat definition

brown rat

a common, omnivorous large rat (Rattus norvegicus) that swims and dives well, usually lives in underground burrows, and spreads various diseases: the mutant form, a white rat, is used for medical experiments

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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