Definition of Lobachevsky, Nikolai in US English:

Lobachevsky, Nikolai

proper noun

  • (1792–1856), Russian mathematician; full name Nikolai Ivanovich Lobachevsky. At about the same time as Gauss and János Bolyai (1802–60), he independently discovered non-Euclidean geometry. His work was not widely recognized until the non-Euclidean nature of space–time was revealed by the general theory of relativity.

Pronunciation

Lobachevsky, Nikolai

/ˌlōbəˈCHefskē/