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keystone

One entry found.

Main Entry:
key·stone 
          Listen to the pronunciation of keystone
Pronunciation:
\ˈkē-ˌstōn\
Function:
noun
Date:
circa 1637
1 : the wedge-shaped piece at the crown of an arch that locks the other pieces in place — see arch illustration 2 : something on which associated things depend for support <determination, a keystone of the puritan ethic — L. S. Lewis> 3 : a species of plant or animal that produces a major impact (as by predation) on its ecosystem and is considered essential to maintaining optimum ecosystem function or structure


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