Cobweb

n.
  1. The network spread by a spider to catch its prey.
  2. A snare of insidious meshes designed to catch the ignorant and unwary.
  3. That which is thin and unsubstantial, or flimsy and worthless; rubbish.
  4. (Zoöl.) The European spotted flycatcher.
  5. Cobweb lawn ,
    a fine linen, mentioned in 1640 as being in pieces of fifteen yards.
    Cobweb micrometer ,
    a micrometer in which threads of cobweb are substituted for wires.