
1) Colliery roof 2) Mine ceiling
Found on
https://www.crosswordclues.com/clue/astel

• (n.) An arch, or ceiling, of boards, placed over the men`s heads in a mine.
Found on
http://thinkexist.com/dictionary/meaning/astel/
As'tel (ăs'tẽl)
noun [ Middle English
astelle piece of wood, Old French
astele splinter, shaving, French
attelle ,
astelle : confer Latin
astula , dim. of
assis board.]
(Mining) An arch, or ceiling, of boards, placed over the men's heads in...
Found on
http://www.encyclo.co.uk/webster/A/135
No exact match found.