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From 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]