Herculean

hėr-kū′lē-an, adj. of or pertaining to Hercules : extremely difficult or dangerous, as the twelve labours of the Greek hero Hercules: of extraordinary strength and size.— Hercules beetle , a gigantic Brazilian lamellicorn beetle, 6 in. long, with a long horn on the head of the male and a smaller one on the thorax; Hercules' choice , toil and duty chosen in preference to ease and pleasure—from a famous story in Xenophon's Memorabilia ; Hercules club , a stick of great size and weight; Pillars of Hercules , the name given by the ancients to two rocks flanking the entrance to the Mediterranean at the Strait of Gibraltar.