/ Thesaurus / M Synonyms of m. j. schleiden Find synonyms for: Noun1. Schleiden, Matthias Schleiden, M. J. Schleidenusage: German physiologist and histologist who in 1838 formulated the cell theory (1804-1881)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language