Hydrometry

1. n. The art or operation of measuring the velocity or discharge of running water, as in rivers, etc.
2. n. The art of determining the specific gravity of liquids, and thence the strength of spirituous liquors, saline solutions, etc.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.