From Longman Dictionary of Contemporary Englishdoppelgangerdop‧pel‧gang‧er /ˈdɒpəlɡæŋə, -ɡeŋ- $ ˈdɑːpəlɡæŋər/ noun [countable] 1 → somebody’s doppelganger2 RFan imaginary spirit that looks exactly like a living person
Examples from the Corpus
doppelganger• This phrase always intrigued Bob; as if the speaker could split herself in two, providing a doppelganger companion.• A doppelganger is invisible except to its owner and is not reflected in a mirror.• Perhaps a human could find its proper doppelganger of organisms in a closed bottle.• The doppelganger stands right behind its owner and always moves swiftly to dodge out of sight.Origin doppelganger (1800-1900) German doppelgänger “double-goer” 