the verbal stem in combination, as skail-door n. (see quots.). skail-water n. (see quots.). skail-wind n. Obsolete a scattering wind.

a door or set of double doors used to control air circulation and regulate the ventilation in a particular area of a coal mine; also called main door.

Mining. A door in a level for directing the ventilating current; a weather-door.

Mining. An opening through which the ventilating current passes.

(a) a louver-hole in a church steeple (cf. 1858 at louvre, n.1 4a); (b) Mining (see quot.).