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1. (Surveying) a device for enlarging or reducing maps, plans, etc
2. (Mathematics) a protractor and scale used in drawing
[C19: from French diagraphe, from Greek diagraphein to represent with lines; see diagram]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a device used for the mechanical reproduction of plans, outlines, etc., on a scale other than that of the original.See also: Drawing
a device used for the mechanical reproduction of plans, outlines, etc., on any scale.See also: Copying
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