megaliths

/M EH0 G AH0 L IH0 TH S/
noun
  1. 1

    A construction involving one or several roughly hewn stone slabs of great size.

  2. 2

    A large stone used in such a construction.

Source: https://en.wiktionary.org/wiki/megalith, https://en.wiktionary.org/wiki/megaliths