ˈhard-burned, -burnt,a. [hard adv. 8 d.] Made hard by intensified firing. 1851C. Cist Cincinnati 214 Walls of hard-burnt brick.1869Rep.Comm.Agric.U.S. 1868 360 Hard-burned terra cotta pipes.1893K. A. Sanborn Truthf. Wom. S. California 45 Half-cylindrical plates of hard-burnt clay.