Main entry: drift, gallery, heading
Definition: a horizontal (or nearly horizontal) passageway in a mine
Usage: they dug a drift parallel with the vein
Main entry: head, header, heading
Definition: a line of text serving to indicate what the passage below it is about
Usage: the heading seemed to have little to do with the text
Main entry: heading, bearing, aim
Definition: the direction or path along which something moves or along which it lies