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addaword.gifdefinition of frack

to force sand, water, and other liquid into rock in order to release gas that is trapped there. The process is known as fracking, which is short for hydraulic fracturing.
The natural gas produced by fracking is the same simple chemical (methane) as the gas extracted by conventional means.
Submitted from United Kingdom on 31/08/2011 15:49:00
Definition of frack from the Open Dictionary – a public resource hosted by Macmillan English Dictionary Online

dark pool

a method of financial trading in which share prices are hidden and not openly available to the public

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bottom line

the amount of money that a business makes or loses