\Thurl\, n. [AS. [thorn]yrel a hole. [root]53. See
{Thirl}, {Thrill}.]
1. A hole; an aperture. [Obs.]
2. (Mining)
   (a) A short communication between adits in a mine.
   (b) A long adit in a coalpit.

\Thurl\, v. t. [See {Thrill}.]
1. To cut through; to pierce. [Obs.] --Piers Plowman.
2. (Mining) To cut through, as a partition between one
   working and another.