An enneadeca
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The name of a 19 sided polygon is enneadecagon.
A 19 sided polygon is called an enneakaidecagon.
The name of a 19 sided polygon is Enneadecagon.
A 19-sided polygon is an enneadecagon (also enneakaidecagon or nonadecagon).
The name of a 12 sided polygon is Dodecagon.