To save this word, you'll need to log in.
oc·tode | \ ˈäkˌtōd \
plural -s
Definition of octode
: a vacuum tube with eight electrodes comprising a cathode, an anode, a control grid, and five additional electrodes that are usually grids
Keep scrolling for more
Test Your Vocabulary
Semantic Drift Quiz
- Which of the following was once a synonym for fun?

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Share octode