arcograph

arcograph

[ahr-kuh-graf, -grahf]
noun Geometry.
an instrument for drawing arcs, having a flexible arc-shaped part adjusted by an extensible straight bar connecting its sides.

Origin:
1815–25; arc + -o- + -graph

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World English Dictionary
arcograph (ˈɑːkəˌɡrɑːf, -ˌɡræf)
 
n
geometry Also called: cyclograph an instrument used for drawing arcs without using a central point

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