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De Forest

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

noun

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


De Forest British  
/ də ˈfɒrɪst /

noun

  1. 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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Yet when De Forest rented a theater in 1923 to demonstrate several sound shorts, studio heads showed no interest.

From The Wall Street Journal • Feb. 14, 2026

Wisconsin purchasing agents on March 26 paid $19,799 for 2,100 N95s at an Ace Hardware in De Forest.

From Washington Times • Dec. 19, 2020

Artists included in this show at the Parker include figures such as Wallace Berman, Kurt Schwitters, Roy De Forest and Franklin Williams.

From Los Angeles Times • Jun. 13, 2019

They are joined by the messier idiosyncrasies of California Funk artists like the ceramist sculptors Ken Price and Robert Arneson and the painters Peter Saul and Roy De Forest, among others.

From New York Times • Aug. 6, 2015

At the tavern Madam Imbert was met by De Forest, who requested a private interview.

From The Expressman and the Detective by Pinkerton, Allan