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German

das Achtzehneck

Noun[ˈaxtseːnˌ.ɛk]

octadecagon

das Achtzehneck is a German noun meaning “octadecagon”.

Genitive: des Achtzehneckes
Plural: die Achtzehnecke

In other languages

Русскийгеометр. восемнадцатиугольник

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Meanings and forms from Wiktionary (CC BY-SA 4.0); example sentences from Tatoeba (CC BY 2.0 FR).