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An instrument consisting of a mirror moved by clockwork, by which a sunbeam is made apparently stationary, by being steadily directed to one spot during the whole of its diurnal period; also, a geodetic heliotrope.

An instrument or machine for showing when the sun arrived at the tropics and equinoctial line.

An instrument for measuring the velocity with which the blood moves in the arteries.

An instrument by which the pressure of the blood in the arteries, or veins, is measured by the height to which it will raise a column of mercury; -- called also a hæmomanometer.

To cut with an ax; to fell with a sharp instrument; -- often with down, or off. Shak.

An instrument for making of angular measurements.

s of metal, covered with an abrading substance or powder, used for sharpening cutting instruments, and especially for setting razors; an oilstone. Tusser. Hone slateSee Polishing slate. -- Hone stone, one of several kinds of stone used for hones. See Novaculite.

An implement for cutting grass or grain; a sickle; an instrument for cutting or lopping; a billhook. Like slashing Bentley with his desperate hook. Pope.

A wind instrument of music; originally, one made of a horn (of an ox or a ram); now applied to various elaborately wrought instruments of brass or other metal, resembling a horn in shape. "Wind his horn under the castle wall." Spenser. See French horn, under French.

An instrument of music formerly popular in Wales, consisting of a wooden pipe, with holes at intervals. It was so called because the bell at the open end was sometimes made of horn.

The art of constructing instruments for making the hours, as clocks, watches, and dials.

An instrument indicating the time of day; a timepiece of any kind; a watch, clock, or dial. Shak.

An account of instruments that show the hour.

The science of measuring time, or the principles and art of constructing instruments for measuring and indicating portions of time, as clocks, watches, dials, etc.

An instrument for measuring time.

An instrument for measuring time, especially the interval of an hour. It consists of a glass vessel having two compartments, from the uppermost of which a quantity of sand, water, or mercury occupies an hour in running through a small aperture unto the lower.

An instrument out of tune or rudely constructed; music badly played.

A stringled instrument, lutelike in shape, in which the sound is produced by the friction of a wheel turned by a crank at the end, instead of by a bow, two of the strings being tuned as drones, while two or more, tuned in unison, are modulated by keys.

An instrument for tracing designs on glass.

An ancient musical instrument played by the action of water; a water organ. [Written also hydraulis.]