The Collaborative International Dictionary
Anamorphoscope
Anamorphoscope \An`a*mor"pho*scope\, n. [Anamorphosis + -scope.] An instrument for restoring a picture or image distorted by anamorphosis to its normal proportions. It usually consists of a cylindrical mirror.
Wiktionary
anamorphoscope
n. A mirrored device which gives a correct image of an anamorphosis.