Mega*lith"ic

from The Collaborative International Dictionary of English v.0.48

Megalith \Meg"a*lith\, n. [Mega- + -lith; cf. F. m['e]galithe.]
   A large stone; especially, a large stone used in constructing
   ancient monuments. -- {Meg`a*lith"ic}, a.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

megalithic \megalithic\ adj.
   Of or pertaining to megaliths or the period during which they
   were erected; as, megalithic monuments like Stonehenge.
   [WordNet 1.5]

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