Etymology

breastbone

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Today it means: The central narrow bone in the front of the chest, connecting the collarbone and the top ribs. Full definition →

Middle English brust-bon ← Old English brēostbān
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The story

  1. Old English · inherited frombrēostbān“breastbone”
  2. Middle English · inherited frombrust-bon
  3. English todaybreastbone

From Middle English brust-bon, brestbon, from Old English brēostbān (“breastbone”), equivalent to breast + bone.

Etymology from Wiktionary, CC BY-SA 4.0.