Etymology

ceruleum

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Today it means: A greenish-blue pigment consisting essentially of cobalt stannate. Full definition →

Latin ceruleum
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The story

  1. Latin · borrowed fromceruleum“dark blue, dark green”
  2. English todayceruleum

From Latin ceruleum (“dark blue, dark green”).

Etymology from Wiktionary, CC BY-SA 4.0.