n. [ AS. þyrel a hole. √53. See Thirl, Thrill. ] 1. A hole; an aperture. [ Obs. ] [ 1913 Webster ]

2. (Mining) (a) A short communication between adits in a mine. (b) A long adit in a coalpit. [ 1913 Webster ]

v. t. [ See Thrill. ] 1. To cut through; to pierce. [ Obs. ] Piers Plowman. [ 1913 Webster ]

2. (Mining) To cut through, as a partition between one working and another. [ 1913 Webster ]

n. (Mining) Same as Thurl, n., 2 (a). [ 1913 Webster ]