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octagonal
Adjective
bát giác, có hình bát giác
having the shape or characteristics of an octagon, which is a polygon with eight sides and eight angles
"The stained glass window in the church depicted religious scenes within an octagonal frame ."
octagon
Noun
bát giác, đa giác tám cạnh
(geometry) a polygon consisting of eight straight sides and eight angles
"The child 's drawing featured a perfectly symmetrical octagon."