Etymology

capstone

C3A1P3S1T1O1N1E1

Today it means: Any of the stones making up the top layer of a wall; a coping stone. Full definition →

Middle English capston
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The story

  1. Middle English · inherited fromcapston
  2. English todaycapstone

From Middle English capston; equivalent to cap + stone.

Etymology from Wiktionary, CC BY-SA 4.0.