crag n.

"a steep, rugged rock; rough, broken, projecting rock, especially a sea-cliff," early 14c. (as a place-name element from c. 1200), probably from a Celtic source akin to Old Irish crec "rock," and carrac "cliff," Welsh craig "rock, stone," Manx creg, Breton krag. A cragsman (1815) is "one dexterous in climbing cliffs overhanging the sea to get the eggs of sea-birds."