Kleptomania

from WordNet (r) 3.0 (2006)

kleptomania
    n 1: an irresistible impulse to steal in the absence of any
         economic motive

from The Collaborative International Dictionary of English v.0.48

Kleptomania \Klep`to*ma"ni*a\, n. [Gr. kle`pths thief + E.
   mania.]
   A propensity to steal, claimed to be irresistible. This does
   not constitute legal irresponsibility. --Wharton.
   [1913 Webster]