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Heptagonal
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adjective
Heptagonal
adj. 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.
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Etymology of 'Heptagonal'
Collaborative International Dictionary of English 0.48
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