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A semicircular projection made at the shoulder of a bastion for the purpose of covering the retired flank, -- found in old fortresses.

d are open at the other end. -- Open flank (Fort.), the part of the flank covered by the orillon. -- Open-front furnace (Metal.), a blast furnace having a forehearth. -- Open harmony (Mus.), harmony the tones of which are widely dispersed, or separated by wide intervals. -- Open hawse (Naut.), a hawse in which the…