sb. local. [Origin unknown: cf. JUD.] In the Bath-stone quarries: ‘A long deep holing or cutting made for the purpose of detaching large blocks of stone from their natural beds’ (Gresley, Gloss. Coal Mining, 1883). Hence Jad v. trans., to form a jad in; Jadder, a stone-cutter (Halliw., 1847–78); Jadding vbl. sb., also attrib.
1871. Morgans, Mining Tools, 148. The ‘jadding pick’ … serves for cutting in long and deep holings, juds, or ‘jads,’ for the purpose of detaching large blocks of stone from their natural beds. Ibid., 153. When the face of any heading from which the stone is to be worked away has been properly jadded under the roof, the side saw-cuts are proceeded with.
