deep web

Short definition from Wiktionary

Proper noun

1. 1
   Alternative form of Deep Web.
2. 2
   The portion of the World Wide Web that is not indexed by conventional search engines.
3. 3
   The Dark Web (the part of the Web only accessible via restricted networks).
4. 4
   Alternative form of Deep Web.

Adjective

1. 1
   Alternative form of deep web.