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pentadecagon

[pen-tuh-dek-uh-gon, -guh n] /ˌpɛn təˈdɛk əˌgɒn, -gən/
noun, Geometry
1.
a polygon having 15 angles and 15 sides.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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