lofthead

English

loft +‎ head

lofthead (plural loftheads)

(obsolete, rare) An overhead cavity in a cave or mineshaft caused by a fall of roof.
- 1880, Transactions of the Manchester Geological Society:
  If a certain vacant space is left above the timbering of a road, it often affords a lodgment for gas, and it is by no means easy to ventilate such a space, or, as it is often called, a "lofthead," in all cases.

United States Bureau of Mines, Dictionary of Mining, Mineral, and Related Terms (1996).

单词	lofthead
释义	lofthead English Etymology loft +‎ head Noun lofthead (plural loftheads) (obsolete, rare) An overhead cavity in a cave or mineshaft caused by a fall of roof. 1880, Transactions of the Manchester Geological Society: If a certain vacant space is left above the timbering of a road, it often affords a lodgment for gas, and it is by no means easy to ventilate such a space, or, as it is often called, a "lofthead," in all cases. References United States Bureau of Mines, Dictionary of Mining, Mineral, and Related Terms (1996).
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