Chip·munk n.  Zool. A squirrel-like animal of the genus Tamias, sometimes called the striped squirrel, chipping squirrel, ground squirrel, hackee. The common species of the United States is the Tamias striatus. [Written also chipmonk, chipmuck, and chipmuk.]
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  Tamias striatus
       n : small striped semiterrestrial eastern American squirrel with
           cheek pouches [syn: eastern chipmunk, hackee, striped
           squirrel, ground squirrel]