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keystone

The Oxford Pocket Dictionary of Current English | 2009 | Copyright

key·stone / ˈkēˌstōn/ • n. a central stone at the summit of an arch, locking the whole together. ∎ [usu. in sing.] the central principle or part of a policy, system, etc., on which all else depends: cooperation remains the keystone of the government's security policy.

keystone

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"keystone." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"keystone." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O999-keystone005.html

"keystone." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-keystone005.html

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Keystone

A Dictionary of Astronomy | 1997 | Copyright

Keystone A quadrilateral-shaped asterism in the constellation Hercules formed by the stars Epsilon, Zeta, Eta, and Pi Herculis.

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"Keystone." A Dictionary of Astronomy. 1997. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"Keystone." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O80-Keystone.html

"Keystone." A Dictionary of Astronomy. 1997. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-Keystone.html

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keystone

A Dictionary of Architecture and Landscape Architecture | 2000 | | Copyright

keystone. Wedge-shaped key-block at the crown of an arch to consolidate a structure.

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JAMES STEVENS CURL. "keystone." A Dictionary of Architecture and Landscape Architecture. 2000. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

JAMES STEVENS CURL. "keystone." A Dictionary of Architecture and Landscape Architecture. 2000. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O1-keystone.html

JAMES STEVENS CURL. "keystone." A Dictionary of Architecture and Landscape Architecture. 2000. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O1-keystone.html

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keystone

Oxford Dictionary of Rhymes | 2007 | Copyright

keystone •flagstone, ragstone •Blackstone, jackstone •sandstone • capstone • hearthstone •headstone • gemstone • whetstone •hailstone • gravestone •freestone, keystone •greenstone • Wheatstone •Tinseltown • ringtone • pitchstone •millstone • whinstone • siltstone •holystone • semitone •stepping stone • coping stone •baritone • acetone • dulcitone •tritone • drystone • milestone •limestone •grindstone, rhinestone •cobblestone • gallstone • brownstone •lodestone • soapstone • duotone •microtone • bluestone • tombstone •moonstone • touchstone •bloodstone, mudstone •sunstone • ironstone • undertone •monotone • cornerstone •Silverstone • overtone •kerbstone (US curbstone) •turnstone •birthstone • flavone • endzone •cortisone • ozone

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Free newspaper and magazine articles

	Keystone Pipeline to expand to serve the U.S. Gulf Coast.(Newsreel) Magazine article from: Pipeline & Gas Journal; 8/1/2008
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	La societe bresilienne Marfrig acquiert keystone foods, et entre sur le... Magazine article from: Quick Frozen Foods International; 7/1/2010