Etymology

tonstein

ton·stein
T1O1N1S1T1E1I1N1

Today it means: A hard, compact, kaolinite-rich claystone formed by the diagenetic alteration of volcanic ash, usually occurring as thin, laterally persistent layers interbedded with coal seams. Full definition →

German Tonstein
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The story

  1. German · borrowed fromTonstein
  2. English todaytonstein

Borrowed from German Tonstein, from Ton (“clay”) + Stein (“stone”).

Etymology from Wiktionary, CC BY-SA 4.0.