meter-, metro-, metr-, -metrical, -metrically, -metron, -metric, -metrist, -meter, -meters, -metry, -metre
2. A measuring instrument that is used to determine the degree of responsiveness to a stimulus; such as, the reactions to various amounts of light: The ophthalmologist used a sensitometer during her examination of Mr. Kaspar's ability to see so she could measure the reactions of the pupils of his eyes to light.
It consists of an arrangement for attachment to the opeining of the salivary duct, by suction or cannulation, and a drop counter or other means of measuring the weight or volumen of the secretions.
2. An instrument used to measure the combined intensity of incident direct solar radiation and diffuse sky radiation.
It operates by comparing the heat produced by the radiation on blackened metal strips with that produced by a known electric current.
2. An instrument for determining he degree of curvature of a sphere or part of a sphere; especially, of optical lenses, or of the tools used for grinding them.
The two types of sphygmomanometers are a mercury column and a gauge with a dial face.
The sphygmomanometer in most frequent use today consists of a gauge attached to a rubber cuff which is wrapped around the upper arm and is inflated to constrict the arteries.
The sphygmomanometer was introduced in 1889 by the Italian physician Scipione Riva-Rocci (1863-1937).
The American physiologist Joseph Erlanger (1874-1965) studied the principles of sphygmomanometry and devised a recording sphygmomanometer.
The word sphygmomanometer was put together from the Greek sphygmos, "the beating of the heart" or "the pulse" + manometer, "a device for measuring pressure or tension".