German

die Elfeckpyramide

Noun[ˈɛlfˌ.ɛkpyʁaˌmiːdə]

hendecagonal pyramid

die Elfeckpyramide is a German noun meaning “hendecagonal pyramid”.

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