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pentadecagon

American  
[pen-tuh-dek-uh-gon, -guhn] / ˌpɛn təˈdɛk əˌgɒn, -gən /

noun

Geometry.
  1. a polygon having 15 angles and 15 sides.


Etymology

Origin of pentadecagon

penta- + decagon

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

That observer had said that the obliquity corresponded to the side of a pentadecagon, or fifteen-sided figure, which is equivalent in modern phraseology to twenty-four degrees of arc.

From A History of Science — Volume 1 by Williams, Edward Huntington

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