Definition of thermo- combining form from the Oxford Advanced Learner's Dictionary

 

thermo-

 combining form
combining form
BrE BrE//ˈθɜːməʊ//
 
; NAmE NAmE//ˈθɜːmoʊ//
 
 
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(in nouns, adjectives and adverbs) connected with heat thermonuclear thermometer Word Originfrom Greek thermos ‘hot’, thermē ‘heat’.
See the Oxford Advanced American Dictionary entry: thermo-