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The Collaborative International Dictionary of English v.0.48 (gcide)

Hydrometer \Hy*drom"e*ter\, n. [Hydro-, 1 -meter: cf. F.
hydrom[`e]tre.]
1. (Physics) An instrument for determining the specific
gravities of liquids, and thence the strength spirituous
liquors, saline solutions, etc.
[1913 Webster]

Note: It is usually made of glass with a graduated stem, and
indicates the specific gravity of a liquid by the depth
to which it sinks in it, the zero of the scale marking
the depth to which it sinks in pure water. Extra
weights are sometimes used to adapt the scale to
liquids of different densities.
[1913 Webster]

2. An instrument, variously constructed, used for measuring
the velocity or discharge of water, as in rivers, from
reservoirs, etc., and called by various specific names
according to its construction or use, as {tachometer},
{rheometer}, {hydrometer}, {pendulum}, etc.; a current
gauge. Hydrometric


Rheometer \Rhe*om"e*ter\, n. [Gr. "rei^n to flow -meter.]
[Written also {reometer}.]
1. (Physics) An instrument for measuring currents, especially
the force or intensity of electrical currents; a
galvanometer.
[1913 Webster]

2. (Physiol.) An instrument for measuring the velocity of the
blood current in the arteries.
[1913 Webster]

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