Of or pertaining to Draco, archon of Athens in or about 621 b. c., and one of the founders of the enlightened Attic polity; or resembling in severity the code of laws said to have been established by him, in which he prescribed the penalty of death for nearly all crimes -for smaller crimes because they merited it, and for greater because he knew of no penalty more severe.Hence Rigorous: applied to any extremely severe, harsh, or oppressive laws.Relating to the constellation Draco.