The Collaborative International Dictionary of English v.0.48:

Hade \Hade\ (h[=a]d), n. [Cf. AS. heald inclined, bowed down, G.
   halde declivity.]
   1. The descent of a hill. [Obs.]
      [1913 Webster]

   2. (Mining) The inclination or deviation from the vertical of
      any mineral vein.
      [1913 Webster]

   3. (Geol. & Mining) The deviation of a fault plane from the
      vertical.

   Note: The direction of the hade is the direction toward which
         the fault plane descends from an intersecting vertical
         line.
         [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Hade \Hade\, v. i. (Mining)
   To deviate from the vertical; -- said of a vein, fault, or
   lode.
   [1913 Webster]