- Sir Robert Alexander,1892–1973, Scottish physicist: helped develop radar.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- Sir Robert Alexander. 1892–1973, Scottish physicist, who played a leading role in the development of radar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- British physicist who pioneered the development of radar. In 1919 he produced a system for locating thunderstorms by tracking their radio emissions. In the 1930s Watson-Watt led the team that developed radar into a practical system for locating aircraft.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.