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heptagonal

a. 七角的,七边形的

七角的,七边形的

The Collaborative International Dictionary of English v.0.48 (gcide)

Heptagonal \Hep*tag"o*nal\, a. [Cf. F. heptagonal.]
Having seven angles or sides.
[1913 Webster]

{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.
[1913 Webster]

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