A spiderweb is the net of fine sticky threads a spider spins to catch flying insects — the flat round one with lines going out from the middle like bicycle spokes is the picture most people have, though spiders build messy sheet-shaped ones in corners too. It is written as one word, 'spiderweb', or as two, 'spider web'; both are fine, and British writers more often just say 'web' or 'cobweb'. There is a useful difference between 'web' and 'cobweb' that dictionaries do not always make clear: a web is the working thing, with a spider on it, while a cobweb is the old dusty abandoned one hanging in the corner of a room that you sweep away. So a horror film has cobwebs; a nature film has webs. Because a spiderweb is beautiful, delicate, and made of many lines joining at points, English uses it for anything with that shape or feel — cracks spreading across broken glass are 'a spiderweb of cracks', a city's small streets can be 'a spiderweb of alleys', and a plan that catches people is 'a web of lies'. Note that 'web' alone now most often means the internet — that use came from exactly this picture, threads connecting everything.

蜘蛛網。分兩種說法：有蜘蛛在上面、正在用的叫 web／spiderweb；牆角積灰塵、蜘蛛早就走了的那種，英文另有 cobweb 一字，中文都講「蜘蛛網」，這個分別要靠英文記。