1. Any of various arboreal rodents of the genus Sciurus and related genera of the family Sciuridae, having a long flexible bushy tail and including the fox squirrel, gray squirrel, and red squirrel. Also called tree squirrel.
2. Any of various other rodents of the family Sciuridae, as the ground squirrel or the flying squirrel.
3. The fur of one of these rodents.
tr.v.squir·reled or squir·relled, squir·rel·ing or squir·rel·ling, squir·rels
To hide or store: squirreled away her money.
[Middle English squirel, from Anglo-Norman esquirel, from Vulgar Latin *scriolus, diminutive of *scrius, alteration of Latin scirus, from Greek skiouros : ski, shadow + our, tail; see ors- in Indo-European roots.]
squirrel /skwrl, skw/ n. a small, usu. gray animal with a long fluffy tail phrasal v.sep. [T] to squirrel s.t. away: to save: Each week, he squirrels away $50 from his paycheck.||He squirrels it away.