Definition of pillars of hercules in English English dictionary
two very tall rocks on either side of the Strait of Gibraltar, a narrow area of sea at the western end of the Mediterranean Sea. According to ancient Greek stories, the rocks had been moved apart by Hercules, and they showed the limits of the known world. Two promontories at the eastern end of the Strait of Gibraltar. They include the Rock of Gibraltar (at Gibraltar) in Europe and Jebel Musa (at Ceuta) in northern Africa. They are fabled to have been set there by Heracles as a memorial in his labour of seizing the cattle of the three-bodied giant Geryon