WordReference Random House Unabridged Dictionary of American English © 2017
meg•a•lith  (megə lith),USA pronunciation n. 
  1. Archaeologya stone of great size, esp. in ancient construction work, as the Cyclopean masonry, or in prehistoric Neolithic remains, as dolmens or menhirs.
meg′a•lithic, adj. 
  • mega- + -lith 1850–55

Collins Concise English Dictionary © HarperCollins Publishers::

megalith /ˈmɛɡəlɪθ/ n
  1. a stone of great size, esp one forming part of a prehistoric monument

ˌmegaˈlithic adj

'megalith' also found in these entries:

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