dodecagon

American  

[doh-dek-uh-gon, -guhn] / doʊˈdɛk əˌgɒn, -gən /

noun

Geometry.

1. a polygon having 12 angles and 12 sides.

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dodecagon British  

/ dəʊˈdɛkəˌɡɒn, ˌdəʊdɛˈkæɡənəl /

noun

1. a polygon having twelve sides

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Other Word Forms

• dodecagonal adjective

Etymology

Origin of dodecagon

First recorded in 1650–60; dodeca- + -gon

Example Sentences

The dodecagon coin was announced in the UK's 2014 budget and has been billed by the Royal Mint as "the most secure coin in the world".

From BBC

A hexagon has six sides, an octagon eight and a dodecagon 12.It's 1.05km.

From BBC

In the Arabic pattern on page 276 the dodecagon appears as the basis, and the remarkable powers of the Arab designer are shown in the use of symmetry without employing regular figures.

From Project Gutenberg

The perimeter of the dodecagon to be inscribed in a circle is greater than the perimeter of the circle.

From Project Gutenberg

Of nouns in on, derived from Greek, the greater part always form the plural regularly; as, etymons, gnomons, ichneumons, myrmidons, phlegmons, trigons, tetragons, pentagons, hexagons, heptagons, octagons, enneagons, decagons, hendecagons, dodecagons, polygons.

From Project Gutenberg