achthoek angolul

octagon [octagons]▼(polygon with eight sides and eight angles)
noun
[UK: ˈɒk.tə.ɡən] [US: ˈɑːk.tə.ˌɡɑːn]

octagonal▼(shaped like an octagon)
adjective
[UK: ɒk.ˈtæ.ɡən.l̩] [US: akˈtæ.ɡən.l̩]