whimstonen.
Etymology: Variant of whinstone n.
the world > the earth > structure of the earth > constituent materials > stone > [noun] > hard stone > whinstone
1822 W. D. Conybeare & W. Phillips i. 204 Concretions are frequent..and are called whim-stones or potlids.
This entry has not yet been fully updated (first published 1923; most recently modified version published online March 2021).