WordReference Random House Unabridged Dictionary of American English © 2020
flex•a•gon  (fleksə gon′),USA pronunciation n. 
  1. Mathematicsa three-dimensional figure having polygonal faces that is constructed from a folded sheet of paper in such a way that different faces are exposed when the figure is flexed along its folds.
  • flex1 + -agon (as in hexagon, pentagon, etc.)

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