/ Thesaurus / L Synonyms of lord rayleigh Find synonyms for: Noun1. Rayleigh, Third Baron Rayleigh, Lord Rayleigh, John William Struttusage: English physicist who studied the density of gases and discovered argon; made important contributions to acoustic theory (1842-1919)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language