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Heptagonal

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Definitions of Heptagonal

Pronunciation : Hep*tag"o*nal
Part of Speech : a.
Etymology : [Cf. F. heptagonal.]
Definition : Defn: Having seven angles or sides. Heptagonal numbers (Arith.), the numbers of the series 1, 7, 18, 34, 55, etc., being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc.
Source : Webster's Unabridged Dictionary, 1913

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