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The Collaborative International Dictionary
Polygonometry

Polygonometry \Pol`y*go*nom"e*try\, n. [Polygon + -metry.] The doctrine of polygons; an extension of some of the principles of trigonometry to the case of polygons.

Wiktionary
polygonometry

n. The doctrine of polygons; an extension of some of the principles of trigonometry to the case of polygons.