/ Thesaurus / R Synonyms of robert brown Find synonyms for: Noun1. Brown, Robert Brownusage: Scottish botanist who first observed the movement of small particles in fluids now known a Brownian motion (1773-1858)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language