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[boh-lom-i-ter, buh-] /boʊˈlɒm ɪ tər, bə-/
noun, Physics.
a device for measuring minute amounts of radiant energy by determining the changes of resistance in an electric conductor caused by changes in its temperature.
Origin of bolometer
1880-85; < Greek bol(ḗ) ray + -o- + -meter
Related forms
[boh-luh-me-trik] /ˌboʊ ləˈmɛ trɪk/ (Show IPA),
bolometrically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for bolometer
Historical Examples
  • A more careful study has been made by Langley and Very with the bolometer.

    The Nature of Animal Light E. Newton Harvey
  • Later, Langley reinvestigated the radiation of Pyrophorus and could detect no heating whatever with the bolometer.

    The Nature of Animal Light E. Newton Harvey
  • We have a heat-measuring instrument, the bolometer, which makes the best thermometer seem Early Victorian.

  • They may be investigated with the bolometer, an instrument invented by the late Professor Langley.

    Astronomy of To-day Cecil G. Dolmage
British Dictionary definitions for bolometer


a sensitive instrument for measuring radiant energy by the increase in the resistance of an electrical conductor
Derived Forms
bolometric (ˌbəʊləˈmɛtrɪk) adjective
bolometrically, adverb
bolometry, noun
Word Origin
C19: from bol-, from Greek bolē ray of light, stroke, from ballein to throw + -meter
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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