Noun | 1. cat squirrel - common reddish-brown squirrel of Europe and parts of AsiaSciurus vulgaris, red squirreltree squirrel - any typical arboreal squirrelgenus Sciurus, Sciurus - type genus of the Sciuridae; typical moderate-sized arboreal squirrels | | 2. cat squirrel - common medium-large squirrel of eastern North America; now introduced into Englandeastern gray squirrel, eastern grey squirrel, Sciurus carolinensistree squirrel - any typical arboreal squirrelgenus Sciurus, Sciurus - type genus of the Sciuridae; typical moderate-sized arboreal squirrels |