Simp·son (s?mp?s?n), George Gaylord 1902-1984. American paleontologist whose synthesis of population genetics with paleontology in his work on fossil mammals contributed to the development of modern evolutionary biology.Simpson, Sir James Young 1811-1870. British physician who pioneered the use of ether and chloroform in obstetrics (1847).American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Simpson (?s?mps?n; ?s?ms?n) n1. (Biography) Sir James Young. 1811?70, Scottish obstetrician, who pioneered the use of chloroform as an anaesthetic2. (Biography) Wallis (Warfield). See Edward VIIICollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Simp?son (?s?mp s?n) n. Wallis Warfield, Windsor, Duchess of. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.