/hayd/ , n. , v. , haded, hading .
n.
1. Geol. the angle between a fault plane and the vertical, measured perpendicular to the strike of the fault; complement of the dip.
2. Mining. the inclination of a vein or seam from the vertical.
v.i.
3. (of a fault, vein, or seam) to incline from a vertical position.
[ 1675-85; orig. uncert. ]