1 In this sense it is nearly synonymous with synopsis. ( 2 n.) The tracing of things to their source, and the resolving of knowledge into its original principles. ( 3 n.) A syllabus, or table of the principal heads of a discourse, disposed in their natural order.
A lightning rod or lightning conductor is a iron rod that is used to make lightning strike it, rather than strike something else. It is part of a lightning protection system. Such a system is made of many such rods. These rods are usually placed at high points of buildings and structures.
a lightning conductor is a device used to save the tall building form lightning 1 a lightning conductor is placed on the top of the building 2 a metal wire is connected to the lightning conductor and made to pass through the outer of the building 3 under the ground a metal plate is placed and the metal wire is connected from the top