What is cromlech stone?
Just so, what is a Cromlech megalith?
Cromlech is a Brythonic word (Breton/Cornish/Welsh) used to describe prehistoric megalithic structures, where crom means "bent" or "curved" and llech means "slab" or "flagstone". In English it usually refers to dolmens, the remains of prehistoric stone chamber tombs.
Similarly one may ask, what is a dolman rock?
A dolmen is a megalithic structure typically formed from a large horizontal stone slab resting on two or more upright slabs. The structures functioned as burial chambers or as sites of ancient cult worship, for example to an earth or fertility goddess.
Over the centuries, they have variously been thought to have been used by Druids for human sacrifice, used as territorial markers, or elements of a complex ideological system, or functioned as early calendars.