hydrometer noun. [hʌɪ'drɒmɪtǝ] M18.
[from HYDRO- + -METER.]
1. An instrument for finding the relative density of a liquid (sometimes also that of a solid) and hence the strength of a solution or mixture. M18.

2. An instrument for finding the speed of a current or a boat. M18.

■ hydro'metric adjective E19.

■ hydro'metrical adjective L18.

■ hydrometry noun (the branch of hydrostatics that deals with) the measurement of relative density by means of a hydrometer E18.

[TahlilGaran] English Dictionary ▲