something formed by or as if by weaving or interweaving.
a thin, silken material spun by spiders and the larvae of some insects, as the webworms and tent caterpillars; cobweb.
a woven fabric, especially a whole piece of cloth in the course of being woven or after it comes from the loom.
the flat woven strip, without pile, often found at one or both ends of an Oriental rug.
something resembling woven material, especially something having an interlaced or latticelike appearance: He looked up at the web of branches of the old tree.
an intricate set or pattern of circumstances, facts, etc.: The thief was convicted by a web of evidence. Who can understand the web of life?
something that snares or entangles; a trap: innocent travelers caught in the web of international terrorism.
Zoology. a membrane that connects the digits of an animal, as the toes of aquatic birds.
the series of barbs on each side of the shaft of a feather. See illus. under feather.
the series on both sides, collectively.
an integral or separate part of a beam, rail, truss, or the like, that forms a continuous, flat, narrow, rigid connection between two stronger, broader parallel parts, as the flanges of a structural shape, the head and foot of a rail, or the upper and lower chords of a truss.
Machinery. an arm of a crank, usually one of a pair, holding one end of a crankpin at its outer end. See illus. under crankshaft.
Architecture. (in a vault) any surface framed by ribbing.
a large roll of paper, as for continuous feeding of a web press.
a network of interlinked stations, services, communications, etc., covering a region or country.
Informal. a network of radio or television broadcasting stations.
(usually initial capital letter) Computers. World Wide Web.
verb (used with object), webbed, webbing.
to cover with or as if with a web; envelop.
to ensnare or entrap.
verb (used without object), webbed, webbing.
to make or form a web.

before 900; Middle English (noun), Old English; cognate with Dutch, Low German webbe, Old Norse vefr; akin to weave

webless, adjective
weblike, adjective

5. network, tissue, tangle, maze.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
web (wɛb)
1.  any structure, construction, fabric, etc, formed by or as if by weaving or interweavingRelated: retiary
2.  See also cobweb a mesh of fine tough scleroprotein threads built by a spider from a liquid secreted from its spinnerets and used to trap insects
3.  a similar network of threads spun by certain insect larvae, such as the silkworm
4.  a fabric, esp one in the process of being woven
5.  a membrane connecting the toes of some aquatic birds or the digits of such aquatic mammals as the otter
6.  the vane of a bird's feather
7.  architect the surface of a ribbed vault that lies between the ribs
8.  the central section of an I-beam or H-beam that joins the two flanges of the beam
9.  any web-shaped part of a casting used for reinforcement
10.  the radial portion of a crank that connects the crankpin to the crankshaft
11.  a thin piece of superfluous material left attached to a forging; fin
12.  a.  a continuous strip of paper as formed on a paper machine or fed from a reel into some printing presses
 b.  (as modifier): web offset; a web press
13.  the woven edge, without pile, of some carpets
14.  a.  (often capital) the web short for World Wide Web
 b.  (as modifier): a web site; web pages
15.  any structure, construction, etc, that is intricately formed or complex: a web of intrigue
vb , webs, webbing, webbed
16.  (tr) to cover with or as if with a web
17.  (tr) to entangle or ensnare
18.  (intr) to construct a web
Related: retiary
[Old English webb; related to Old Saxon, Old High German webbi, Old Norse vefr]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. webb "woven fabric," from P.Gmc. *wabjan (cf. O.S. webbi, O.N. vefr, Du. webbe, O.H.G. weppi, Ger. gewebe "web"), from PIE *webh- (related to O.E. wefan; see weave). Meaning "spider's web" is first recorded c.1220. Applied to the membranes between the toes of ducks and
other aquatic birds from 1576. Internet sense is from 1992, shortened from World Wide Web (1990); website is from 1994; webmaster is attested from 1993.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

web (wěb)

  1. A membrane or fold of skin connecting the toes, as of certain mammals.

  2. A structure of delicate, threadlike filaments characteristically spun by spiders.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
web   (wěb)  Pronunciation Key 
  1. A structure of fine, elastic, threadlike filaments characteristically spun by spiders to catch insect prey. The larvae of certain insects also weave webs that serve as protective shelters for feeding and may include leaves or other plant parts.

  2. A membrane or fold of skin connecting the toes in certain animals, especially ones that swim, such as water birds and otters. The web improves the ability of the foot to push against water.

  3. also Web The World Wide Web.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

Web definition

See Internet.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

WEB definition

Donald Knuth's self-documenting literate programming, with algorithms and documentation intermixed in one file. They can be separated using Weave and Tangle. Versions exist for Pascal and C. Spiderweb can be used to create versions for other languages. FunnelWeb is a production-quality literate-programming tool.
(ftp://princeton.edu/), (ftp://labrea.stanford.edu/).
["Literate Programming", D.E. Knuth, Computer J 27(2):97-111, May 1984].

Web definition

World-Wide Web
"The Web" is the World-Wide Web. "A web" is part of it on some specific website.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
If you're reading this online, chances are good that you are using a web
  browser to do so.
He is acclaimed for his advocacy of web standards, books and a sometimes
  prickly manner.
The crosses, zigzags, and spirals woven by some spiders have long puzzled web
Word is that they're writing a book based on their web site.
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