pentadecagon
[ pen-tuh-dek-uh-gon, -guhn ]
/ ˌpɛn təˈdɛk əˌgɒn, -gən /
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noun Geometry.
a polygon having 15 angles and 15 sides.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021