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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A hole; an aperture.

2. (Science: chemical) A short communication between adits in a mine. A long adit in a coalpit.

Origin: AS. Yrel a hole. 53. See Thirl, Thrill.

1. To cut through; to pierce.

2. (Science: chemical) To cut through, as a partition between one working and another.

See: thrill.