lissen means A cleft or hollow in rock. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
noun
- A cleft or hollow in rock.“And I remember in my youth, in the Lisne of a Rock at Kingſcote in Gloceſtershire, I found at least a Bushel of Petrified Cockles actually distinct one from another, each near as big as my Fist.”