meter-, metro-, metr-, -metrical, -metrically, -metron, -metric, -metrist, -meters, -metry, -metre

1. An instrument that is used to measure oxygen in a controlled space, such as an oxygen tank or incubator.
2. A photoelectric instrument used for measuring the degree of oxygen saturation in a fluid; such as, blood.
3. An instrument for determining, photoelectrically, the degree of oxygen saturation, or concentration, of a sample of blood.

In medicine, the calculation of the oxygen saturation level of hemoglobin in a blood sample by using an oximeter.

An apparatus for measurement of the amount of oxygen in the blood.

The investigation of the temperature of climates and oceans in past ages.

A hydrometer that can be used to measure the relative density of any liquid.

An instrument which functions as a compass, a sundial, and the universal timedial.

1. A variable quantity or value; specific uses include physics, a quantity that is used in a relationship involving several quantities and is held fixed, but in general it may be allowed to have different values.
2. In computer programming, data that can take different values at the execution time of a function, procedure, macro-instruction, or subroutine.

Only a specialist in mathematics or computing might know precisely what it means.

When the word does have a discernible meaning, it is usurping the place of a far simpler and more straightforward term; such as, boundaries, limits, or guidelines.

An apparatus for recording the incidence of disease in a specified locality.

Now considered obsolete: Sir Ronald Ross’ term for the quantitative study of parasitic invasion and infection in individuals or groups of individuals.