cap·stone /ˈkæpˌston/
頂石
Cap·stone n. Paleon. A fossil echinus of the genus Cannulus; -- so called from its supposed resemblance to a cap.
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capstone
n 1: a final touch; a crowning achievement; a culmination [syn: finishing
touch, copestone]
2: a stone that forms the top of wall or building [syn: copestone,
coping stone, stretcher]