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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.