Bo‐lom″e‐ter (�), n. [Gr. � a stroke, ray + -meter.] (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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.