Definition of octagon:
geometric figure (part of speech: noun)
- scalene triangle,
- right-angle triangle,
- equilateral triangle,
- isosceles triangle,
- five or more (part of speech: noun)
- "Castles and Cave Dwellings of Europe", Sabine Baring-Gould.
This abbot erected the rood screen between the nave and choir, added the octagon above the tower after removing the Norman turrets and parapets, and probably built those E. E. bays on each side of the nave which are nearest to the W. front.- "Hertfordshire", Herbert W Tompkins.
- "The Best Psychic Stories", Various.