Sha·drach n. Metal. A mass of iron on which the operation of smelting has failed of its intended effect; -- so called from Shadrach, one of the three Hebrews who came forth unharmed from the fiery furnace of Nebuchadnezzar. (See --Dan. iii. 26, 27.)
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  Shadrach
     Aku's command, the Chaldean name given to Hananiah, one of the
     Hebrew youths whom Nebuchadnezzar carried captive to Babylon
     (Dan. 1:6, 7; 3:12-30). He and his two companions refused to bow
     down before the image which Nebuchadnezzar had set up on the
     plains of Dura. Their conduct filled the king with the greatest
     fury, and he commanded them to be cast into the burning fiery
     furnace. Here, amid the fiery flames, they were miraculously
     preserved from harm. Over them the fire had no power, "neither
     was a hair of their head singed, neither had the smell of fire
     passed on them." Thus Nebuchadnezzar learned the greatness of
     the God of Israel. (See ABEDNEGO.)