De·For·est(dĭ fôr′ĭst), Lee 1873-1961.
American electrical engineer and inventor who patented more than 300 inventions. In 1907 he patented the triode electron tube, which made it possible to amplify and detect radio waves.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.