Толковый словарь английского языка - keystone
Keystone
keystone
noun Date: circa 1637 the wedge-shaped piece at the crown of an arch that locks the other pieces in place, something on which associated things depend for support , 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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1.
n. 1 the central principle of a system, policy, etc., on which all the rest depends. 2 a central stone at the summit of an arch locking the whole together. ...Толковый словарь английского языка Oxford English Reference
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