a fine, filmy substance consisting of cobwebs spun by small spiders, seen especially in autumn. • used to refer to something very light, thin, and insubstantial or delicate: in the light from the table lamp, his hair was blond gossamer | [as modifier] : gossamer wings.

After defining this word, I know how delicate and intricate a spiders web is and how it is essential to a it's survial.