The Collaborative International Dictionary
chipping squirrel
Chipmunk \Chip"munk`\, n. [Indian name.] (Zo["o]l.) 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.]
Wiktionary
chipping squirrel
n. (context dated English) A chipmunk.