One of the mysteries of the English language finally explained.
A plane figure having fifteen straight sides and fifteen angles; a quindecagon.
Late 17th century; earliest use found in William Alingham (fl. 1694–1710). Apparently irregularly from pen- (in ancient Greek πέντε five: see penta-) + decagon. Compare post-classical Latin pentedecagonum, Hellenistic Greek πεντεκαιδεκάγωνον.
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