Etymology

penny-grass

Today it means: yellow rattle (Rhinanthus minor or Rhinanthus major (syn. Rhinanthus crista-galli)). Full definition →

Middle English peny gras
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The story

  1. Middle English · inherited frompeny gras
  2. English todaypenny-grass

From Middle English peny gras; equivalent to penny + grass.

Etymology from Wiktionary, CC BY-SA 4.0.