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An instrument to measure angles, esp. one used by geologists to measure the dip of strata.

An instrument for measuring external angles.

An instrument for measuring the amount of carbonic acid in a mixture.

The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.

An instrument for measuring the height of objects. Knight.

set of implements, or utensils, for a given duty, experimental or operative; any complex instrument or appliance, mechanical or chemical, for a specific action or operation; machinery; mechanism.

"power of appointment") a person to enjoy an estate or other specific property; also, the instrument by which the designation is made.

Fit or fitted; suited; suitable; appropriate. They have always apt instruments. Burke. A river . . . apt to be forded by a lamb. Jer. Taylor.

screw; as, Archimedean drill, propeller, etc. Archimedean screw, or Archimedes' screw, an instrument, said to have been invented by Archimedes, for raising water, formed by winding a flexible tube round a cylinder in the form of a screw. When the screw is placed in an inclined position, and the lower end immersed in wa…

An instrument for drawing a circular arc without the use of a central point; a cyclograph.

An instrument for measuring the specific gravity of fluids; a form hydrometer.

A slender part of an instrument or machine, projecting from a trunk, axis, or fulcrum; as, the arm of a steelyard.

An ancient astronomical instrument.

A place where arms and instruments of war are deposited for safe keeping.

Instruments or weapons of offense or defense. He lays down his arms, but not his wiles. Milton. Three horses and three goodly suits of arms. Tennyson.

The adaptation of a composition to voices or instruments for which it was not originally written.

called Artesium), in France. Artesian wells, wells made by boring into the earth till the instrument reaches water, which, from internal pressure, flows spontaneously like a fountain. They are usually of small diameter and often of great depth.

A distinct portion of an instrument, discourse, literary work, or any other writing, consisting of two or more particulars, or treating of various topics; as, an article in the Constitution. Hence: A clause in a contract, system of regulations, treaty, or the like; a term, condition, or stipulation in a contract; a con…

as: (a) One who enunciates distinctly. (b) One who prepares and mounts skeletons. (c) An instrument to cure stammering.

The brush or instrument used in sprinkling holy water; an aspergill.