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key•stone



Pronunciation: (kē'stōn"), [key]
n.
1. the wedge-shaped piece at the summit of an arch, regarded as holding the other pieces in place.
2. something on which associated things depend: the keystone of one's philosophy.
3. Also called key'stone sack". Baseball Slang.See second base (def. 1).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

key stationKeystone comedy
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