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deep web

or deep Web, Deep Web

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noun
  1. the portion of the Internet that is hidden from conventional search engines, as by encryption; the aggregate of unindexed websites: private databases and other unlinked content on the deep web.
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Origin of deep web

First recorded in 2000–05
Also called invisible web, Invisible Web.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for deep web

deep Web

noun
  1. computing the part of the World Wide Web not accessible through conventional search engines
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012