a. and sb. Obs. rare. [ad. late L. quinquangulus, -um (Priscian, Boeth.), f. quinque five + angulus ANGLE. Cf. obs. F. quinquangle (Godef.).]
A. adj. ‘Having five angles or corners’ (Blount, Glossogr., 1656).
B. sb. A pentagon.
1668. H. More, Div. Dial., I. 29. To inscribe a Quinquangle into a Circle.
1677. Plot, Oxfordsh., 334. Rather a quinquangle than a square.
1788. T. Taylor, Proclus, I. 178. A triangle … will in this case have all its angles acute, and a quinquangle all its angles obtuse.
