A very large (mega-) stone (-lith) particularly in ancient construction work such as the Cyclopean masonry, or in prehistoric Neolithic remains, as dolmens or menhirs.
Meg"a*lith (?), n. [Mega- + -lith; cf. F. m'egalithe.]
A large stone; especially, a large stone used in ancient building.
© Webster 1913.
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