Test Your Vocabulary

Take Our 10-Question Quiz

Name That Thing

Take our visual vocab quiz

Test Your Knowledge »

True or False?

A quick quiz about stuff worth knowing

Take It Now »

Join Us on FB & Twitter

Get the Word of the Day and More

Facebook | Twitter
  1. Word Games
  2. Word of the Day
  3. New Words & Slang
  4. Video
 

vacuum tube

2 ENTRIES FOUND:
  1. vacuum tube (noun)
  2. vacuum-tube voltmeter (noun)

vacuum tube

noun

Definition of VACUUM TUBE

: an electron tube evacuated to a high degree of vacuum
See vacuum tube defined for English-language learners »
See vacuum tube defined for kids »

First Known Use of VACUUM TUBE

1859

Learn More About VACUUM TUBE

Browse

Next Word in the Dictionary: vacuum–tube voltmeter
Previous Word in the Dictionary: vacuum tank
All Words Near: vacuum tube

Seen & Heard

What made you want to look up vacuum tube? Please tell us where you read or heard it (including the quote, if possible).