one of a set of slabs on the top of a wall, building, etc
WordReference Random House Learner's Dictionary of American English © 2025
cap•stone /ˈkæpˌstoʊn/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2025- Building, Architecturea finishing stone of a structure.
- the most glorious and usually final achievement:The Nobel prize was the capstone of his long career.
cap•stone
(kap′stōn′),USA pronunciation n.
- Building, Architecturea finishing stone of a structure.
- the crowning achievement, point, element, or event.
- Middle English. See cap1, stone 1350–1400
Collins Concise English Dictionary © HarperCollins Publishers::
'capstone' also found in these entries (note: many are not synonyms or translations):