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The Collaborative International Dictionary
Eidograph

Eidograph \Ei"do*graph\, n. [Gr. e'i^dos form + graph.] An instrument for copying drawings on the same or a different scale; a form of the pantograph. [1913 Webster] ||

Wiktionary
eidograph

n. An instrument for copying drawings on the same or a different scale; a form of pantograph.