A large stone resting on two or more others, like a table. (Welsh, crom, bent; llech, a flat stone.) Weyland Smith's cave (Berkshire), Trevethy stone (Cornwall), Kit's Coty House (Kent). Irby and Mangles saw twenty-seven structures just like these on the banks of the Jordan; at Plas Newydd (Anglesey) are two cromlechs: in Cornwall they are numeròus; so are they in Wales; some few are found in Ireland, as the “killing-stone” in Louth. In Brittany, Denmark, Germany, and some other parts of Europe, cromlechs are to be found.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894