Present participle of 'hade': the act of measuring or describing the angle/inclination of a geological vein or fault.
From 'hade' (to incline) with the present participle suffix '-ing,' forming the continuous aspect of the verb used in geology and mining.
Mining records from the 1800s describe surveyors 'hading the veins'—it's technical vocabulary that was absolutely essential for calculating how deep to dig.
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