Definition of "ballium" [bal•li•um]

• Bailey (fortification) (noun)

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• "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."