hade

• POS: Noun, Verb (intransitive)

CIDE DICTIONARY

hade, n. [Cf. AS. heald inclined, bowed down, G. halde declivity.].

•  The descent of a hill.  [1913 Webster]
•  The inclination or deviation from the vertical of any mineral vein.  [1913 Webster]
•  The deviation of a fault plane from the vertical.

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

hade, v. i. 

 To deviate from the vertical; -- said of a vein, fault, or lode.  [1913 Webster]

OXFORD DICTIONARY

hade, n. & v. Geol.
--n. an incline from the vertical.
--v.intr. incline from the vertical.

Etymology

17th c., perh. dial. form of head