Ebullioscope n. : An instrument for observing the boiling point of liquids, especially for determining the alcoholic strength of a mixture by the temperature at which it boils.

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Taxonomy
ebullioscope, free encyclopedia, solute, boiling point, molecular weight, search, instrument, liquid, alcoholic strength, mixture, non-volatile, ebullioscopy, Brossard-Vidal, alcoholic content, sugars, density, presence, the French.

Defination from the web:
ebullioscope was invented in 1838 by Brossard-Vidal, and was used for measuring alcoholic content. ... This improvement made the ebullioscope a standard apparatus to determine the molecular weight of substances in solution by using the ebullioscopic constant of the solvent. ...