Definition of bolometer noun from the Oxford Advanced Learner's Dictionary

 

bolometer

 noun
noun
BrE BrE//ˈlɒmɪtə(r)//
 
; NAmE NAmE//ˈlɑːmɪtər//
 
(physics)
 
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a device for measuring radiant energy Word Origin late 19th cent.: from Greek bolē ‘ray of light’ + -meter (see meter).
See the Oxford Advanced American Dictionary entry: bolometer