octagonal
/ɑkˈtæɡənəl/ adjective C2- Shaped like an octagon, in having eight sides and eight angles.
From the library
The baron, followed by the count, traversed a long series of apartments, in which the prevailing characteristics were heavy magnificence and the gaudiness of ostentatious wealth, until he reached the boudoir of Madame Danglars—a small octagonal-shaped room, hung with pink satin, covered with white Indian muslin.
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