lofthead

noun

noun

Etymology From loft + head.

Obsolete, Rare An overhead cavity in a cave or mineshaft caused by a fall of roof.

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.1880, Transactions of the Manchester Geological Society:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.