WordNet (3.0)WordNet (3.0)
(n)radiometer that is extremely sensitive
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
n. [ Radio- + micrometer. ] (Physics) A very sensitive modification or application of the thermopile, used for indicating minute changes of radiant heat, or temperature. [ 1913 Webster ]
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