Duralumin

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

Duralumin (also called duraluminum, duraluminium, duralum, dural(l)ium, or dural) is a trade name for one of the earliest types of age-hardenable aluminium–copper alloys. The term is a combination of Düren, dur (a German prefix meaning "hard"), and aluminium. Its use as a trade name is obsolete.

Excerpt from the Wikipedia article “Duralumin”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Image creator/original uploader Centpacrr at en.wikipedia, CC BY 3.0, via Wikimedia Commons.