A single part of a larger whole.
A part of a hospital that has a specialised function.
A named and agreed standard amount used for measuring something.
A quantity of a drug, enzyme, hormone or of blood, taken as a standard for measurement and producing a given effect.
A machine or device.
The term applied to a quantity assumed as a standard for measurement. Thus, the unit of insulin is ‘the specific activity contained in such an amount of the standard preparation as the Medical Research Council may from time to time indicate as the quantity exactly equivalent to the unit accepted for international use’.