Ra′di‐o‐mi‐crom″e‐ter (–ō̍‐mī̍‐krŏm″ē̍‐tẽr), n. [Radio- + micrometer.] (Physics) A very sensitive modification or application of the thermopile, used for indicating minute changes of radiant heat, or temperature.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.