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Elsewhere on the web
In the heptagonal version of the 4x400 relay, which featured only Ivy League teams, Penn finished second at 3: 16.14 - the best time posted by the squad all year.— The Daily Pennsylvanian
The little bloodstone table on which the heptagonal coffer stands was drawn to the centre of the room.— The Jewel of Seven Stars
This was, of course, heptagonal.— Spacehounds of IPC
The effect of a heptagonal stem on an octagonal base or plinth is certainly odd.— Bell's Cathedrals: The Abbey Church of Tewkesbury with some Account of the Priory Church of Deerhurst Gloucestershire
Some distance beyond the graveyard we came to a section of a tower, heptagonal in form, which had just been dug out to a depth of 4 feet by the natives of the village of Zaidan.— Across Coveted Lands or a Journey from Flushing (Holland) to Calcutta Overland

Century Dictionary (1)
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