1. In chemical analysis, a substance that changes color within a certain definite range of pH or oxidation potential, or in any way renders visible the completion of a chemical reaction; e.g., litmus, phenolsulfonphthalein. 2. An isotope that is used as a tracer. 3. The labeled substance whose distribution between reactants of a system is used to determine the amount of analyte present. [L. one that points out]
- alizarin i. a solution consisting of 1 g sodium alizarin sulfonate dissolved in 100 mL distilled water; used as an i. for free acidity in gastric contents.
- clinical i. a measure, process, or outcome used to judge a particular clinical situation and indicate whether the care delivered was appropriate.
- health i. variable, susceptible to direct measurement, that reflects the state of health of persons in a community.
- oxidation-reduction i. a substance that undergoes a definite color change at a specific oxidation potential. SYN: redox i..
- redox i. SYN: oxidation-reduction i..

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in·di·ca·tor 'in-də-.kāt-ər n a substance (as a dye) used to show visually usu. by its capacity for color change the condition of a solution with respect to the presence of free acid or alkali or some other substance (as in detecting the end point of a titration) <litmus and phenolphthalein are acid-base \indicators>

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in·di·ca·tor (inґdĭ-ka″tər) [L.] 1. the index finger (index [TA]). 2. the extensor muscle of the index finger (musculus extensor indicis [TA]). 3. a substance, usually a dye or intermediate, that shows the concentration of a substance, the completion of a reaction, or the attainment of a particular pH range by a change in color or other visible sign.

Medical dictionary. 2011.

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  • Indicator — Indicator …   Wikipédia en Français

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  • Indicator — may mean:* pH indicator, a chemical detector for protons in acid base titrations * Redox indicator, a chemical detector for redox titrations * Complexometric indicator, a chemical detector for metal ions in complexometric titrations * Zeta… …   Wikipedia

  • Indicator — In di*ca tor ([i^]n d[i^]*k[=a] t[ e]r), n. [L.: cf. F. indicateur.] [1913 Webster] 1. One who, or that which, shows or points out; as, a fare indicator in a street car. [1913 Webster] 2. (Mach.) A pressure gauge; a water gauge, as for a steam… …   The Collaborative International Dictionary of English

  • indicator — (n.) 1660s, from L.L. indicator, agent noun from indicare (see INDICATION (Cf. indication)). As a finger muscle, from 1690s …   Etymology dictionary

  • Indicātor — (lat.), 1) der Streckmuskel des Zeigefingers; 2) (Honigkukuk), Gattung der kukuksartigen Klettervögel …   Pierer's Universal-Lexikon

  • indicator — I noun attestant, attester, augury, auspice, badge, beacon, clue, cue, emblem, ensign, flag, foreshadowing, harbinger, herald, hint, index, informant, informer, landmark, mark, note, pointer, precursor, prognostic, semaphore, sign, stamp, symbol …   Law dictionary

  • indicator — [n] sign barometer, beacon, clue, dial, gauge, guide, hint, index, mark, meter, omen, pointer, signal, symbol, warning; concepts 274,529,673,689 …   New thesaurus

  • indicator — ► NOUN 1) a thing that indicates a state or level. 2) a gauge or meter of a specified kind. 3) a flashing light on a vehicle to show that it is about to change lanes or turn. 4) Brit. an information board or screen in a railway station, airport,… …   English terms dictionary

  • indicator — [in′di kāt΄ər] n. 1. a person or thing that indicates; specif., a) any device, as a gauge, dial, register, or pointer, that measures or records and visibly indicates b) an apparatus that diagrams the varying fluid pressure of an engine in… …   English World dictionary

  • indicator — Used in the context of general equities. technical or fundamental measurement that securities analysts use to forecast the market s direction, such as investment advisory sentiment, volume of stock trading, direction of interest rates, and buying …   Financial and business terms

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