Etymology

horse chestnut

Today it means: Any of several tree species of genus Aesculus, especially Aesculus hippocastanum, common in temperate northern hemisphere. Full definition →

translingual Castanea equina
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The story

  1. translingual · calque ofCastanea equina
  2. English todayhorse chestnut

Calque of translingual Castanea equina (literally “equine chestnut”).

Etymology from Wiktionary, CC BY-SA 4.0.