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Use "ballium" in a sentence
"And my dark apprehensions gained double force when a stone was dislodged by my foot (which may have trembled), and rolled with a sharp echo down into the ballium, or whatever it should be called, where these desperadoes stood."
"When that was won, the ballium and the inner wall could still be disputed."
"East and West of the yard is seen the semi-circular moat or ditch; and on an eminence near the western extremity of the ballium, stands the keep or round tower, the walls of which are said to have been twenty-one feet thick."