pentadecagon

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

noun Geometry.

a polygon having 15 angles and 15 sides.

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Origin of pentadecagon

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020