megagon

mega- +‎ -gon

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megagon (plural megagons)

1. A polygon with one million sides.
   • 1999, Mark Dugopolski, College Algebra and Trigonometry, page 505:

     Find the constant of proportionality for a decagon, kilogon, and megagon.

   • 2003, Stan Gibilisco, Geometry Demystified:

     There can exist a regular polygon with 1000 sides (this might be called a "regular kilogon"), 1,000,000 sides (a "regular megagon"), or 1,000,000,000 sides (a "regular gigagon").

   • 2007, Arthur Greenberg, From Alchemy to Chemistry in Picture and Story:

     A megagon is close to the perfection of a circle — a kind of generational transmutation.

• 1,000,000-gon