shyst
obs. form of schist.
| 1793 [Earl Dundonald] Descr. Culross 6 A stratum of Feruginous Sulphurious Slate or Shyst. |
shyst
obs. form of schist.
| 1793 [Earl Dundonald] Descr. Culross 6 A stratum of Feruginous Sulphurious Slate or Shyst. |
Oxford English Dictionary