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From The Collaborative International Dictionary of English v.0.48:
Orillon \O*ril"lon\, n. [F., lit., a little ear, from oreille an ear, fr. L. oricula, auricula, dim. of auris an ear. See Ear.] (Fort.) A semicircular projection made at the shoulder of a bastion for the purpose of covering the retired flank, -- found in old fortresses. [1913 Webster]