ground squirrel definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of various small, burrowing squirrels (esp. genus Spermophilus)
ground squirrel definition by American Heritage Dictionary
Any of several burrowing or terrestrial squirrels of the genus Citellus or Spermophilus, including many species that hibernate during the winter.