bolometer Meaning, Definition & Usage

  1. noun an instrument that measures heat radiation; extremely sensitive

WordNet

Bo*lom"e*ter noun
Etymology
Gr. a stroke, ray + -meter.
Definitions
  1. (Physics) An instrument for measuring minute quantities of radiant heat, especially in different parts of the spectrum; -- called also actinic balance, thermic balance. S. P. Langley.

Webster 1913