icosihenagon

From Ancient Greek εἰκοσιέν (eikosién, “twenty-one”) +‎ -gon, from εἴκοσι (eíkosi) (twenty) + ἕν (hén) (one).

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• Hyphenation: i‧co‧si‧hen‧a‧gon

icosihenagon (plural icosihenagons)

1. (geometry) A polygon with twenty-one edges and twenty-one angles.

• 21-gon