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Webster 1913 Edition

Noun.

(Coal Mining)

The ruins of the fallen roof resulting from the removal of the pillars and stalls.

Raymond.

See also: þurst

thurst ‎(plural thursts)

(mining) The ruins of the fallen roof in a coal mine, resulting from the removal of the pillars and stalls.
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Western Proto-Germanic *þurstuz, from Proto-Indo-European *ters- ‎(“dry”). Cognates include Ancient Greek τέρσομαι ‎(térsomai), Sanskrit तृष्यति ‎(tṛṣyati) and Latin terra.

thurst m