The Collaborative International Dictionary of English v.0.48:

Spider web \Spi"der web"\, or Spider's web \Spi"der's web"\ .
   (Zool.)
   The silken web which is formed by most kinds of spiders,
   particularly the web spun to entrap their prey; -- also
   called cobweb. See Geometric spider, Triangle spider,
   under Geometric, and Triangle.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cobweb \Cob"web`\, n. [Cob a spider + web.]
   1. The network spread by a spider to catch its prey.
      [1913 Webster]

   2. A snare of insidious meshes designed to catch the ignorant
      and unwary.
      [1913 Webster]

            I can not but lament thy splendid wit
            Entangled in the cobwebs of the schools. --Cowper.
      [1913 Webster]

   3. That which is thin and unsubstantial, or flimsy and
      worthless; rubbish.
      [1913 Webster]

            The dust and cobwebs of that uncivil age. --Sir P.
                                                  Sidney.
      [1913 Webster]

   4. (Zool.) The European spotted flycatcher.
      [1913 Webster]

   Cobweb lawn, a fine linen, mentioned in 1640 as being in
      pieces of fifteen yards. --Beck. Draper's Dict.
      [1913 Webster]

            Such a proud piece of cobweb lawn.    --Beau. & Fl.

   Cobweb micrometer, a micrometer in which threads of cobweb
      are substituted for wires.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cobweb
    n 1: a fabric so delicate and transparent as to resemble a web
         of a spider
    2: filaments from a web that was spun by a spider [syn:
       cobweb, gossamer]
    3: a dense elaborate spider web that is more efficient than the
       orb web

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "cobweb":
   air, animal fiber, artificial fiber, bait, birdlime, bola, bubble,
   cambric tea, capillament, chaff, chip, cilium, cirrus, cork,
   denier, dishwater, down, dragnet, dust, entanglement, ether, fairy,
   feather, fiber, fibrilla, filament, filamentule, fishhook,
   flagellum, flue, fluff, fly, foam, froth, fuzz, gill net, gossamer,
   ground bait, gruel, hair, hank, hook, house of cards, jig, lariat,
   lasso, lime, lure, matchwood, meshes, milk and water, mote, net,
   noose, plug, pound net, purse seine, reed, rope of sand,
   sand castle, seine, skein, snare, sniggle, spinner, sponge,
   springe, spume, squid, strand, straw, suture, tendril, thistledown,
   thread, threadlet, toils, trawl, water, web, wobbler



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COBWEB
       COntent-Based image retrieval on the WEB (WWW, ESPRIT)