Definitions of domain name server on the Web:

• In computing, a name server (also spelled nameserver) consists of a program or computer server that implements a name-service protocol. ...
  en.wikipedia.org/wiki/Domain_name_server
• A computer that provides domain name information to a network; a computer that is part of the Domain Name System
  en.wiktionary.org/wiki/domain_name_server
• A Domain Name Server, or DNS, accepts requests from programs, or other DNS, to convert domain names into IP addresses. ...
  www.dnc.org.nz/story/30094-31-1.html
• A computer that translates hostnames to IP addresses on behalf of requesting clients.
  oreilly.com/catalog/debian/chapter/book/glossary.html
• Used to convert between the name of machine on the Internet and its numeric address.
  www.netproject.com/docs/migoss/v1.0/glossary.html
• A server that contains a database of host names and their corresponding IP addresses.
  www.equiinet.com/cachepilot/support/cachepilotglossary.asp
• A server that relates an internet domain name (such as www.pixelism.co.uk) to an IP address.
  www.pixelism.co.uk/support_glossary.htm
• A computer that converts host names, such as rohan.sdsu.edu to its corresponding IP Address, such as 191.130.1.10. An SDSU computer provides this service any time mail is sent or received and permits users to use TELNET and FTP between SDSU and other sites.
  www.incredible.co.za/services/glossary/glossary.asp
• The computer that actually "remembers" all the names of the other machines and their IP Addresses. These are remembered as numbers.
  www.e-traffik.com/resource-center.html
• The domain name is the initial part of a web address (up to the first ‘/’). A domain name is translated via huge tables standardised across ...
  www.mailboxfox.co.uk/glossary.aspx
• Any of these terms refers to the initial part of a URL, down to the first /, where the domain and name of the host or SERVER computer are listed ...
  bcm3800-fall-2008.blogspot.com/2008/09/sept-8-basic-definitions.html