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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 heptagonal
 (a.)七角的,七邊形的

From: Webster's Revised Unabridged Dictionary (1913)

 Hep·tag·o·nal a.  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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