from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An arch or ceiling of boards placed above the workers' heads in a mine.
from the GNU version of the Collaborative International Dictionary of English
- n. An arch, or ceiling, of boards, placed over the men's heads in a mine.
from The Century Dictionary and Cyclopedia
- n. A ceiling of boards overhead in a mining-drift, designed to protect the men when at work from falling rocks.
Old English astelle piece of wood, Old French astele splinter, shaving, French attelle, astelle: compare Latin astula, diminutive of assis board. (Wiktionary)