Etymology

costean

C3O1S1T1E1A1N1

Today it means: A trench in solid rock intersected by pits which reveals mineral veins. Full definition →

Cornish kodha
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The story

  1. Cornish · borrowed fromkodha“to fall, happen”
  2. English todaycostean

Presumably from Cornish kodha (“to fall, happen”) + sten (“tin”).

Etymology from Wiktionary, CC BY-SA 4.0.