keystone

1. The top stone of an arch.

   Schlussstein, Scheitelstein

   замко́вый ка́меньzamkóvyj kámenʹ, замо́кzamók

   замковий каміньzamkovyj kaminʹ, замокzamok, ключključ

   the central building block at the top of an arch or vault

2. Something on which other things depend for support.

   замко́вый ка́меньzamkóvyj kámenʹ

3. A retail price that is double the cost price; a markup of 100%.

4. The combination of the shortstop and second baseman.

1. You are the keystone of this business.

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2. Sex appeal is the keystone of our civilization.

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3. Salmon are a keystone species.

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4. Bison is a keystone species.

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5. Environmentalists are opposing the Keystone XL pipeline.

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