Definition of polygonometry in English:

polygonometry

Pronunciation /ˌpɒlɪɡəˈnɒmɪtri/ /pəˌlɪɡəˈnɒmɪtri/

noun

rare Mathematics
  • The branch of mathematics that deals with the measurement and properties of polygons in the way that trigonometry deals with those of triangles.

Origin

Late 18th century; earliest use found in New Annual Register 1790. From polygon + -o- + -metry, after French polygonométrie, itself after French trigonométrie.