Lord Rayleigh lord·ray·leigh uncommon noun 1. English physicist who studied the density of gases and discovered argon; made important contributions to acoustic theory (1842-1919) SynonymsRayleighThird Baron RayleighLord RayleighJohn William Strutt Related words Broader terms physicist WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
