[ 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


bo·lo·met·ric [boh-luh-me-trik] /ˌboʊ ləˈmɛ trɪk/, adjectivebo·lo·met·ri·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for bolometer

  • A more careful study has been made by Langley and Very with the bolometer.

  • 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
  • Later, Langley reinvestigated the radiation of Pyrophorus and could detect no heating whatever with the bolometer.

British Dictionary definitions for bolometer

/ (bəʊˈlɒmɪtə) /


a sensitive instrument for measuring radiant energy by the increase in the resistance of an electrical conductor

Derived forms of bolometer

bolometric (ˌbəʊləˈmɛtrɪk), adjectivebolometrically, adverbbolometry, noun

Word Origin for bolometer

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