bord
noun
ˈbȯ(ə)rd
variants or less commonly board
ˈbō(ə)rd 
ˈbȯ-
plural -s
: a straight road or passageway driven at right angles to the main cleavage of the coal in a coal mine
Word History
Etymology
board entry 1; probably from the former practice of laying boards in mine passageways to form a relatively smooth surface along which the coal was dragged in sledges