/ Thesaurus / F Synonyms of felix klein Find synonyms for: Noun1. Klein, Felix Kleinusage: German mathematician who created the Klein bottle (1849-1925)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language