L de forest

De Forest

[di fawr-ist, for-]
Lee, 1873–1961, U.S. inventor of radio, telegraphic, and telephonic equipment.
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World English Dictionary
De Forest (də ˈfɒrɪst)
Lee. 1873--1961, US inventor of telegraphic, telephonic, and radio equipment: patented the first triode valve (1907)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
DeForest   (dĭ-fôr'ĭst)  Pronunciation Key 
American electrical engineer and inventor who is known as "the father of radio." He patented more than 300 inventions, including the triode electron tube, which made it possible to amplify and detect radio waves.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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