Here you will find one or more explanations in English for the word Hydrometry.
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Hydrometry
Hydrometry Hy*drom"e*try, n. [Cf. F. hydrom[`e]trique.]
1. The art of determining the specific gravity of liquids,
and thence the strength of spirituous liquors, saline
solutions, etc.
2. The art or operation of measuring the velocity or
discharge of running water, as in rivers, etc.
Meaning of Hydrometry from wikipedia