What is the meaning of Megalith?

  1. A large stone slab making up a prehistoric monument, or part of such a monument.
  2. A prehistoric monument made up of one or more large stones.

A large stone slab making up a prehistoric monument, or part of such a monument.

A prehistoric monument made up of one or more large stones.

A large stone or block of stone used in the construction of a modern structure.

Source: wiktionary.org