De Forest

[ di fawr-ist, for- ]
/ dɪ ˈfɔr ɪst, ˈfɒr- /

noun

Lee,1873–1961, U.S. inventor of radio, telegraphic, and telephonic equipment.

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British Dictionary definitions for de forest

De Forest
/ (də ˈfɒrɪst) /

noun

Lee. 1873–1961, US inventor of telegraphic, telephonic, and radio equipment: patented the first triode valve (1907)
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