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.]