| indicators and reagents | Substances used for the detection, identification, analysis, etc. Of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., colour, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidisers, reducers, fluxes, and colourimetric reagents. (12 Dec 1998) |
|---|---|
| indicatrix | <microscopy> A three-dimensional construction of the optical relationships in a crystal. Radii proportional in length to either refractive index or velocity may be used to represent variations in those values throughout a crystal (or oriented polymer fibres and films). (05 Aug 1998) |
| indices | Alternative plural of index. (05 Mar 2000) |
| indicolite | <chemical> A variety of tourmaline of an indigo-blue colour. Origin: L. Indicum indigo: cf. F. Indicolithe. Source: Websters Dictionary (01 Mar 1998) |
| indiction | 1. Declaration; proclamation; public notice or appointment. "Indiction of a war." "Secular princes did use to indict, or permit the indiction of, synods of bishops." (Jer. Taylor) 2. A cycle of fifteen years. This mode of reckoning time is said to have been introduced by Constantine the Great, in connection with the payment of tribute. It was adopted at various times by the Greek emperors of Constantinople, the popes, and the parliaments of France. Through the influence of the popes, it was extensively used in the ecclesiastical chronology of the Middle Ages. The number of indictions was reckoned at first from 312 a. D, but since the twelfth century it has been reckoned from the birth of Christ. The papal indiction is the only one ever used at the present day. To find the indiction and year of the indiction by the first method, subtract 312 from the given year a. D, and divide by 15; by the second method, add 3 to the given year a. D, and the divide by 15. In either case, the quotient is the number of the current indiction, and the remainder the year of the indiction. See Cycle of indiction, under Cycle. Origin: L. Indictio: cf. F. Indiction. See Indict, Indite. Source: Websters Dictionary (01 Mar 1998) |