rithern.
/ˈrʌɪðə/, U.S. /ˈraɪðər/ Mining. Chiefly English regional (northern and north midlands).
= horse n. 11.
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the world > the earth > minerals > mineral deposits > [noun] > vein > vein of ore > layer of material between two lodes
rither1681
1681 T. Houghton Compl. Miner (E.D.S.) Rither, a stone or thin cliff that lies in the vein;..sometimes this rither is so thick, it parts the vein.
a1700 Brit. Mus. Add. MS. 6685 in E. Manlove Rhymed Chron. (new ed.) Gloss. 31 A rither point is that point of the stone where a vein comes in or goes out of another.
1778 W. Pryce Mineralogia Cornubiensis 323/1 Horse, a portion of dead ground in a Lode, which widens like a horse's back from the spine. (See plate... A Rider and a Rither in Yorkshire.)
1829 S. Glover Hist. County of Derby I. 66 The intermediate substances that divide them are called rythers.
1851 Act 14 & 15 Victoria c. 94 §14 When Two Veins approach each other, but are parted with a Rither,..and the Rither..exceeds Three Feet in Thickness [etc.].
1920 A. H. Fay Gloss. Mining & Mineral Industry 573/1 Rither, the matrix within which an ore occurs.
This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).
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n.1681