Results

Definition of octagon : 1. A plane figure of eight sides and eight angles.
2. Any structure ( as a fortification) or place with eight sides or angles.

Synonyms:

cuboid, cross, diamond, flare, fractal, chevron

dodecahedron, pentagon, parallelogram, polygon, octahedron, scalene triangle, hexahedron, polyhedron, pentahedron, rectangle, tetragon, hexagon, trapezoid, right-angle triangle, cube, quadrilateral, equilateral triangle, triangle, rhombus, heptagon, dodecagon, cusp, square, tetragram, quadrangle, tetrahedron, isosceles triangle, decagon, parallelepiped

hexad, septuple, octavo, hundredfold, billion, octet, million, hundred, fourscore, duodecimo, teens, sextuple, score, trillion, decennium, grand, jillion, gross, sevenfold, thousand, sixfold, dozen, decade, octave

Usage examples:

• Night and day he came up here from his little city on the plain, sat in his pleasant octagon room, and descended into his winding subterranean passages, and hermit- like visited the hollow cells. - "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.
• It gave upon an octagon- shaped room with a curious floor of sheet- lead. - "The Best Psychic Stories", Various.