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white rat

noun
  1. an albino variety of the Norway rat, Rattus norvegicus, used in biological experiments.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for white rat

white rat

noun
  1. a white variety of the brown rat (Rattus norvegicus), used extensively in scientific research
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

white rat in Medicine

white rat

n.
  1. A domesticated albino variety of the Norway rat, used extensively in laboratory experiments.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.