Lobachevskyian
I believe that there is a specific kind of geometry Lobachevsky developed, called Lobachevskyan geometry. That definition, if I am correct, would be different from the definition of the term as "of or related to Nikolai Lobachevsky" as a person. Sort of like the difference between Freudian psychoanalysis and Freudian in the sense of "of or related to the man named Sigmund Freud", one is related specifically to a scientific theory, the other is related more broadly to biographical information. That's why I added the other definition.
The sense that's already there mentions his work on non-Euclidian geometry, right? It says, paraphrasing, relating to the person Lobachevsky or his work on non-Euclidian geometry.
But Lobachevskyan also can mean specifically "hyperbolic geometry". I think that sense should be in a separate definition, because its only tangentially related to "of or related to Nikolai Lobachevsky".
But the point is, that the first definition already says, "Of or pertaining ... to his work ... on non-Euclidian geometry".
Maybe it should be two definitions, but if so, you need to remove the part from the first one about the non-Euclidian geometry so that the definitions aren't redundant. So in that case, one would be only about the person and the other only about the geometry.
