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thermionics

[thurm-ahy-on-iks, thur-mee-] /ˌθɜrm aɪˈɒn ɪks, ˌθɜr mi-/
noun, (used with a singular verb)
1.
the branch of physics that deals with thermionic phenomena.
Origin of thermionics
1925-1930
First recorded in 1925-30; See origin at thermion, -ics
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for thermionics

thermionics

/ˌθɜːmɪˈɒnɪks/
noun
1.
(functioning as sing) the branch of electronics concerned with the emission of electrons by hot bodies and with devices based on this effect, esp the study and design of thermionic valves
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
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