A′re‐om″e‐ter (?; 277), n. [Gr. αραιὄσ thin, rare + -meter: cf. F. aréomètre.] (Physics) An instrument for measuring the specific gravity of fluids; a form hydrometer.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.