Dutch word achthoekig comes from Dutch -ig, Dutch achthoek ((geometry) octagon.)

Detailed word origin of achthoekig

Dictionary entry	Language	Definition
-ig	Dutch (nld)	-ed, having (when attached to a noun preceded by an adjective that describes the noun). -y; forms adjectives from nouns.
achthoek	Dutch (nld)	(geometry) octagon.
achthoekig	Dutch (nld)	(geometry) shaped like an octagon. (literally) octagonal, having eight corners.

Words with the same origin as achthoekig