n. An instrument used to measure the quantity of electric charge.
the GNU version of the Collaborative International Dictionary of English
n. An instrument for measuring the voltaic electricity passing through it, by its effect in decomposing water or some other chemical compound acting as an electrolyte.
The Century Dictionary and Cyclopedia
n. An electrolytic cell arranged for quantitative measurement of the amount of decomposition produced by the passage through it of an electric current, and hence used as an indirect means of measuring the strength of the current.
Word Usage
"Never more than 128 yet detected, using a Mexican voltameter."