Of or pertaining to megaliths, to the people who made them, or to the period when they were made(adjective)
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Use "megalithic" in a sentence
"There is here nothing to suggest the Doric of Paestum and Selinus, much to recall the megalithic buildings of Syria, and the sculpture of the farther East."
"If, as seems probable, the idea of megalithic building was brought to Europe by the immigration of a new race it is possible that a branch of this race entered Sicily."
"These latter do not seem to have brought the idea of megalithic building with them, as their earlier tombs are simple mounds."