'Doubleganger' definitions:

Definition of 'Doubleganger'

From: GCIDE

Doubleganger \Dou"ble*gang`er\, n. [G. doppelg[aum]nger; doppel double + g[aum]nger walker.] An apparition or double of a living person; a doppelg[aum]nger.
Either you are Hereward, or you are his doubleganger. --C. Kingsley. [Webster 1913 Suppl.]