thermion

[ thurm-ahy-uhn, -on; thur-mee-uhn ]

/ ˈθɜrmˌaɪ ən, -ɒn; ˈθɜr mi ən /

Save This Word!

See synonyms for: thermionic on Thesaurus.com

noun Physics.

an ion emitted by incandescent material.

QUIZ

WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?

Smoothly step over to these common grammar mistakes that trip many people up. Good luck!

Question 1 of 7

Fill in the blank: I can’t figure out _____ gave me this gift.

who

whom

TAKE THE QUIZ TO FIND OUT

Origin of thermion

First recorded in 1910–15; therm- + ion

OTHER WORDS FROM thermion

therm·i·on·ic, adjectivetherm·i·on·i·cal·ly, adverb

Words nearby thermion

thermette, thermic, thermic fever, Thermidor, Thermidorian, thermion, thermionic, thermionic current, thermionic emission, thermionics, thermionic tube

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

British Dictionary definitions for thermion

thermion

/ (ˈθɜːmɪən) /

noun

physics an electron or ion emitted by a body at high temperature

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

Scientific definitions for thermion

thermion

[ thûr′mī′ən ]

An electrically charged particle or ion that is emitted by a heated conducting material. The electrons emitted from the cathodes of electron tubes (such as cathode ray tubes) are thermions.