WordReference Random House Unabridged Dictionary of American English © 2020
quin•dec•a•gon  (kwin dekə gon′),USA pronunciation n. [Geom.]
  1. Mathematicsa polygon having 15 angles and 15 sides.
  • Latin quīndec(im) fifteen + -agon (extracted from pentagon, hexagon, etc.)
  • 1560–70

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