icosagon

From Ancient Greek εἰκοσάγωνος (eikoságōnos, “having twenty sides”), from εἴκοσι (eíkosi, “twenty”) + γωνία (gōnía, “angle”). Equivalent to icosa- +‎ -gon.

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icosagon (plural icosagons)

1. (geometry) A polygon with twenty sides and twenty angles.
   • 1993 The upper half of a regular icosagon frame is folded. - author? - Space Structures 4

• 20-gon

• icosagonal