‖ guhr Min.
(guːr)
See also gur.
[Ger. dial.; lit. ‘ferment’, related to gähren to ferment: see yeast.]
A loose earthy deposit from water found in the cavities of rocks.
| [1686, 1753: see gur.] 1770 Engestrom tr. Cronstedt's Mineral. xiv. 23 Gypseous Earth properly so called, Guhr. 1839 Ure Dict. Arts 185 Guhr, lac-lunæ, and fossil meal. 1852 Th. Ross tr. Humboldt's Trav. I. ii. 78 note, The siliceous gurh [sic] of the volcanoes of the Isle of France. |